diff --git a/mod/forum/amd/build/inpage_reply.min.js b/mod/forum/amd/build/inpage_reply.min.js
index b25f8e1c809..33b572babbb 100644
--- a/mod/forum/amd/build/inpage_reply.min.js
+++ b/mod/forum/amd/build/inpage_reply.min.js
@@ -1 +1 @@
-define(["jquery","core/templates","core/notification","mod_forum/repository","mod_forum/selectors"],function(a,b,c,d,e){var f={THREADED:2,NESTED:3,FLAT_OLDEST_FIRST:1,FLAT_NEWEST_FIRST:-1},g=function(a){var b=a.find(e.post.inpageSubmitBtnText),c=a.find(e.post.loadingIconContainer),d=a.outerWidth();a.css("width",d),b.addClass("hidden"),c.removeClass("hidden")},h=function(a){var b=a.find(e.post.inpageSubmitBtnText),c=a.find(e.post.loadingIconContainer);a.css("width",""),b.removeClass("hidden"),c.addClass("hidden")},i=function(i){i.on("click",e.post.inpageSubmitBtn,function(j){j.preventDefault();var k,l=a(j.currentTarget),m=l.parent().find(e.post.inpageReplyButton),n=l.parents(e.post.inpageReplyForm).get(0),o=n.elements.post.value.trim(),p=n.elements.reply.value,q=n.elements.subject.value,r=l.parents(e.post.forumContent),s=parseInt(i.find(e.post.modeSelect).get(0).value);o.length&&(g(l),m.prop("disabled",!0),d.addDiscussionPost(p,q,o).then(function(a){var b=a.messages.reduce(function(a,b){return"success"==b.type&&(a+="<p>"+b.message+"</p>"),a},"");return c.addNotification({message:b,type:"success"}),a}).then(function(a){n.reset();var c=a.post;switch(k=c.id,s){case f.THREADED:return b.render("mod_forum/forum_discussion_threaded_post",c);case f.NESTED:return b.render("mod_forum/forum_discussion_nested_post",c);default:return b.render("mod_forum/forum_discussion_post",c)}}).then(function(a,c){var d;return s!=f.FLAT_OLDEST_FIRST&&s!=f.FLAT_NEWEST_FIRST||(d=r.parents(e.post.repliesContainer).children().get(0)),void 0==d&&(d=r.siblings(e.post.repliesContainer).children().get(0)),s==f.FLAT_NEWEST_FIRST?b.prependNodeContents(d,a,c):b.appendNodeContents(d,a,c)}).then(function(){return h(l),m.prop("disabled",!1),r.find(e.post.inpageReplyContent).hide()}).then(function(){location.href="#p"+k})["catch"](function(a){return h(l),m.prop("disabled",!1),c.exception(a)}))})};return{init:function(a){i(a)}}});
\ No newline at end of file
+define(["jquery","core/templates","core/notification","mod_forum/repository","mod_forum/selectors"],function(a,b,c,d,e){var f={THREADED:2,NESTED:3,FLAT_OLDEST_FIRST:1,FLAT_NEWEST_FIRST:-1},g=function(a){var b=a.find(e.post.inpageSubmitBtnText),c=a.find(e.post.loadingIconContainer),d=a.outerWidth();a.css("width",d),b.addClass("hidden"),c.removeClass("hidden")},h=function(a){var b=a.find(e.post.inpageSubmitBtnText),c=a.find(e.post.loadingIconContainer);a.css("width",""),b.removeClass("hidden"),c.addClass("hidden")},i=function(i){i.on("click",e.post.inpageSubmitBtn,function(j){j.preventDefault();var k,l=a(j.currentTarget),m=l.parent().find(e.post.inpageReplyButton),n=l.parents(e.post.inpageReplyForm).get(0),o=n.elements.post.value.trim(),p=n.elements.reply.value,q=n.elements.subject.value,r=l.parents(e.post.forumContent),s=void 0!=n.elements.privatereply&&n.elements.privatereply.checked,t=parseInt(i.find(e.post.modeSelect).get(0).value);o.length&&(g(l),m.prop("disabled",!0),d.addDiscussionPost(p,q,o,s).then(function(a){var b=a.messages.reduce(function(a,b){return"success"==b.type&&(a+="<p>"+b.message+"</p>"),a},"");return c.addNotification({message:b,type:"success"}),a}).then(function(a){n.reset();var c=a.post;switch(k=c.id,t){case f.THREADED:return b.render("mod_forum/forum_discussion_threaded_post",c);case f.NESTED:return b.render("mod_forum/forum_discussion_nested_post",c);default:return b.render("mod_forum/forum_discussion_post",c)}}).then(function(a,c){var d;return t!=f.FLAT_OLDEST_FIRST&&t!=f.FLAT_NEWEST_FIRST||(d=r.parents(e.post.repliesContainer).children().get(0)),void 0==d&&(d=r.siblings(e.post.repliesContainer).children().get(0)),t==f.FLAT_NEWEST_FIRST?b.prependNodeContents(d,a,c):b.appendNodeContents(d,a,c)}).then(function(){return h(l),m.prop("disabled",!1),r.find(e.post.inpageReplyContent).hide()}).then(function(){location.href="#p"+k})["catch"](function(a){return h(l),m.prop("disabled",!1),c.exception(a)}))})};return{init:function(a){i(a)}}});
\ No newline at end of file
diff --git a/mod/forum/amd/build/posts_list.min.js b/mod/forum/amd/build/posts_list.min.js
index 8b4740c206e..644a0042e9f 100644
--- a/mod/forum/amd/build/posts_list.min.js
+++ b/mod/forum/amd/build/posts_list.min.js
@@ -1 +1 @@
-define(["jquery","core/templates","core/notification","mod_forum/selectors","mod_forum/inpage_reply"],function(a,b,c,d,e){var f=function(e){e.on("click",d.post.inpageReplyLink,function(e){if(e.preventDefault(),window.location.hash){var f=window.location.href.split("#")[0];history.pushState({},document.title,f)}var g=a(e.currentTarget).parents(d.post.forumCoreContent),h=g.find(d.post.forumSubject),i=a(e.currentTarget).parents(d.post.forumContent),j={postid:a(i).data("post-id"),reply_url:a(e.currentTarget).attr("href"),sesskey:M.cfg.sesskey,parentsubject:h.html()};if(i.find(d.post.inpageReplyContent).length){var k=i.find(d.post.inpageReplyContent);k.slideToggle(300),k.is(":visible")&&k.find("textarea").focus()}else b.render("mod_forum/inpage_reply",j).then(function(a,c){return b.appendNodeContents(g,a,c)}).then(function(){return i.find(d.post.inpageReplyContent).slideToggle(300).find("textarea").focus()}).fail(c.exception)})};return{init:function(a){f(a),e.init(a)}}});
\ No newline at end of file
+define(["jquery","core/templates","core/notification","mod_forum/selectors","mod_forum/inpage_reply"],function(a,b,c,d,e){var f=function(e){e.on("click",d.post.inpageReplyLink,function(e){if(e.preventDefault(),window.location.hash){var f=window.location.href.split("#")[0];history.pushState({},document.title,f)}var g=a(e.currentTarget).parents(d.post.forumCoreContent),h=g.find(d.post.forumSubject),i=a(e.currentTarget).parents(d.post.forumContent),j={postid:a(i).data("post-id"),reply_url:a(e.currentTarget).attr("href"),sesskey:M.cfg.sesskey,parentsubject:h.html(),canreplyprivately:a(e.currentTarget).data("can-reply-privately")};if(i.find(d.post.inpageReplyContent).length){var k=i.find(d.post.inpageReplyContent);k.slideToggle(300),k.is(":visible")&&k.find("textarea").focus()}else b.render("mod_forum/inpage_reply",j).then(function(a,c){return b.appendNodeContents(g,a,c)}).then(function(){return i.find(d.post.inpageReplyContent).slideToggle(300).find("textarea").focus()}).fail(c.exception)})};return{init:function(a){f(a),e.init(a)}}});
\ No newline at end of file
diff --git a/mod/forum/amd/build/repository.min.js b/mod/forum/amd/build/repository.min.js
index b20b5325704..019d014aefe 100644
--- a/mod/forum/amd/build/repository.min.js
+++ b/mod/forum/amd/build/repository.min.js
@@ -1 +1 @@
-define(["core/ajax"],function(a){var b=function(b,c,d){var e={methodname:"mod_forum_set_subscription_state",args:{forumid:b,discussionid:c,targetstate:d}};return a.call([e])[0]},c=function(b,c,d){var e={methodname:"mod_forum_add_discussion_post",args:{postid:b,message:d,subject:c}};return a.call([e])[0]},d=function(b,c,d){var e={methodname:"mod_forum_toggle_favourite_state",args:{discussionid:c,targetstate:d}};return a.call([e])[0]},e=function(b,c,d){var e={methodname:"mod_forum_set_lock_state",args:{forumid:b,discussionid:c,targetstate:d}};return a.call([e])[0]},f=function(b,c,d){var e={methodname:"mod_forum_set_pin_state",args:{discussionid:c,targetstate:d}};return a.call([e])[0]};return{setDiscussionSubscriptionState:b,addDiscussionPost:c,setDiscussionLockState:e,setFavouriteDiscussionState:d,setPinDiscussionState:f}});
\ No newline at end of file
+define(["core/ajax"],function(a){var b=function(b,c,d){var e={methodname:"mod_forum_set_subscription_state",args:{forumid:b,discussionid:c,targetstate:d}};return a.call([e])[0]},c=function(b,c,d,e){var f={methodname:"mod_forum_add_discussion_post",args:{postid:b,message:d,subject:c,options:[{name:"private",value:e}]}};return a.call([f])[0]},d=function(b,c,d){var e={methodname:"mod_forum_toggle_favourite_state",args:{discussionid:c,targetstate:d}};return a.call([e])[0]},e=function(b,c,d){var e={methodname:"mod_forum_set_lock_state",args:{forumid:b,discussionid:c,targetstate:d}};return a.call([e])[0]},f=function(b,c,d){var e={methodname:"mod_forum_set_pin_state",args:{discussionid:c,targetstate:d}};return a.call([e])[0]};return{setDiscussionSubscriptionState:b,addDiscussionPost:c,setDiscussionLockState:e,setFavouriteDiscussionState:d,setPinDiscussionState:f}});
\ No newline at end of file
diff --git a/mod/forum/amd/src/inpage_reply.js b/mod/forum/amd/src/inpage_reply.js
index 06decf40955..7b03f1d13ef 100644
--- a/mod/forum/amd/src/inpage_reply.js
+++ b/mod/forum/amd/src/inpage_reply.js
@@ -86,6 +86,7 @@ define([
             var postid = form.elements.reply.value;
             var subject = form.elements.subject.value;
             var currentRoot = submitButton.parents(Selectors.post.forumContent);
+            var isprivatereply = form.elements.privatereply != undefined ? form.elements.privatereply.checked : false;
             var mode = parseInt(root.find(Selectors.post.modeSelect).get(0).value);
             var newid;
 
@@ -93,7 +94,7 @@ define([
                 showSubmitButtonLoadingIcon(submitButton);
                 allButtons.prop('disabled', true);
 
-                Repository.addDiscussionPost(postid, subject, message)
+                Repository.addDiscussionPost(postid, subject, message, isprivatereply)
                     .then(function(context) {
                         var message = context.messages.reduce(function(carry, message) {
                             if (message.type == 'success') {
diff --git a/mod/forum/amd/src/posts_list.js b/mod/forum/amd/src/posts_list.js
index f04f640ea5d..e68c87e9024 100644
--- a/mod/forum/amd/src/posts_list.js
+++ b/mod/forum/amd/src/posts_list.js
@@ -59,7 +59,8 @@ define([
                 postid: $(currentRoot).data('post-id'),
                 "reply_url": $(e.currentTarget).attr('href'),
                 sesskey: M.cfg.sesskey,
-                parentsubject: currentSubject.html()
+                parentsubject: currentSubject.html(),
+                canreplyprivately: $(e.currentTarget).data('can-reply-privately')
             };
 
             if (!currentRoot.find(Selectors.post.inpageReplyContent).length) {
diff --git a/mod/forum/amd/src/repository.js b/mod/forum/amd/src/repository.js
index e7d32afb27e..05331605da2 100644
--- a/mod/forum/amd/src/repository.js
+++ b/mod/forum/amd/src/repository.js
@@ -43,13 +43,17 @@ define(['core/ajax'], function(Ajax) {
         return Ajax.call([request])[0];
     };
 
-    var addDiscussionPost = function(postid, subject, message) {
+    var addDiscussionPost = function(postid, subject, message, isprivatereply) {
         var request = {
             methodname: 'mod_forum_add_discussion_post',
             args: {
                 postid: postid,
                 message: message,
-                subject: subject
+                subject: subject,
+                options: [{
+                    name: "private",
+                    value: isprivatereply,
+                }]
             }
         };
         return Ajax.call([request])[0];
diff --git a/mod/forum/classes/local/exporters/post.php b/mod/forum/classes/local/exporters/post.php
index ea097b4aa8c..4528c602d8e 100644
--- a/mod/forum/classes/local/exporters/post.php
+++ b/mod/forum/classes/local/exporters/post.php
@@ -156,6 +156,11 @@ class post extends exporter {
                         'null' => NULL_ALLOWED,
                         'description' => 'Whether the user can control the read status of the post',
                     ],
+                    'canreplyprivately' => [
+                        'type' => PARAM_BOOL,
+                        'null' => NULL_ALLOWED,
+                        'description' => 'Whether the user can post a private reply',
+                    ]
                 ]
             ],
             'urls' => [
@@ -355,6 +360,7 @@ class post extends exporter {
         $canreply = $capabilitymanager->can_reply_to_post($user, $discussion, $post);
         $canexport = $capabilitymanager->can_export_post($user, $post);
         $cancontrolreadstatus = $capabilitymanager->can_manually_control_post_read_status($user);
+        $canreplyprivately = $capabilitymanager->can_reply_privately_to_post($user, $post);
 
         $urlfactory = $this->related['urlfactory'];
         $viewurl = $canview ? $urlfactory->get_view_post_url_from_post($post) : null;
@@ -417,7 +423,8 @@ class post extends exporter {
                 'split' => $cansplit,
                 'reply' => $canreply,
                 'export' => $canexport,
-                'controlreadstatus' => $cancontrolreadstatus
+                'controlreadstatus' => $cancontrolreadstatus,
+                'canreplyprivately' => $canreplyprivately
             ],
             'urls' => [
                 'view' => $viewurl ? $viewurl->out(false) : null,
diff --git a/mod/forum/templates/forum_discussion_post.mustache b/mod/forum/templates/forum_discussion_post.mustache
index 5a5e28fb64a..791619fbd9c 100644
--- a/mod/forum/templates/forum_discussion_post.mustache
+++ b/mod/forum/templates/forum_discussion_post.mustache
@@ -257,6 +257,7 @@
                                                         role="menuitem"
                                                         data-post-id="{{id}}"
                                                         data-action="collapsible-link"
+                                                        data-can-reply-privately="{{canreplyprivately}}"
                                                         title="{{#str}} reply, mod_forum {{/str}}"
                                                     >
                                                         {{#str}} reply, mod_forum {{/str}}
diff --git a/mod/forum/templates/inpage_reply.mustache b/mod/forum/templates/inpage_reply.mustache
index da44f5e6757..82d33ace993 100644
--- a/mod/forum/templates/inpage_reply.mustache
+++ b/mod/forum/templates/inpage_reply.mustache
@@ -52,7 +52,13 @@
                 <button class="btn btn-secondary" title="{{#str}} cancel, core {{/str}}" data-action="collapsible-link">
                     {{#str}} cancel, core {{/str}}
                 </button>
-                <button title="{{#str}} advanced, core {{/str}}" data-action="forum-advanced-reply" class="btn btn-link float-right" type="submit">
+                {{#canreplyprivately}}
+                <div class="form-check form-check-inline">
+                    <input type="checkbox" class="form-check-input" id="private-reply" title="{{#str}} privatereply, forum {{/str}}" name="privatereply"/>
+                    <label class="form-check-label" for="private-reply">{{#str}} privatereply, forum {{/str}}</label>
+                </div>
+                {{/canreplyprivately}}
+                <button title="{{#str}} advanced, forum {{/str}}" data-action="forum-advanced-reply" class="btn btn-link float-right" type="submit">
                     {{#str}} advanced, core {{/str}}
                 </button>
             </div>
diff --git a/mod/forum/tests/behat/inpage_reply.feature b/mod/forum/tests/behat/inpage_reply.feature
index 6fa68bba61b..af697560adc 100644
--- a/mod/forum/tests/behat/inpage_reply.feature
+++ b/mod/forum/tests/behat/inpage_reply.feature
@@ -5,13 +5,15 @@ Feature: Students can reply to a discussion in page.
     Given the following "users" exist:
       | username | firstname | lastname | email |
       | student1 | Student | 1 | student1@example.com |
+      | teacher1 | Teacher | 1 | teacher1@example.com |
     And the following "courses" exist:
       | fullname | shortname | category |
       | Course 1 | C1 | 0 |
     And the following "course enrolments" exist:
       | user | course | role |
       | student1 | C1 | student |
-    And I log in as "admin"
+      | teacher1 | C1 | editingteacher |
+    And I log in as "teacher1"
     And I am on "Course 1" course homepage with editing mode on
     And I add a "Forum" to section "1" and I fill the form with:
       | Forum name | Test forum name |
@@ -23,12 +25,23 @@ Feature: Students can reply to a discussion in page.
       | Subject | Discussion 2 |
       | Message | Discussion contents 2, first message |
     And I log out
-    And I log in as "student1"
-    And I am on "Course 1" course homepage
 
   Scenario: Confirm inpage replies work
+    Given I log in as "student1"
+    And I am on "Course 1" course homepage
     Given I reply "Discussion 2" post from "Test forum name" forum using an inpage reply with:
       | post | Discussion contents 1, third message |
     Then I should see "Discussion contents 1, third message"
     When I reload the page
+    Then I should see "Discussion contents 1, third message"
+
+  Scenario: Confirm inpage replies work - private reply
+    Given I log in as "teacher1"
+    And I am on "Course 1" course homepage
+    And I reply "Discussion 2" post from "Test forum name" forum using an inpage reply with:
+      | post | Discussion contents 1, third message |
+      | privatereply | 1                            |
+    Then I should see "Discussion contents 1, third message"
+    Then I should see "This post was made privately and is not visible to all users."
+    When I reload the page
     Then I should see "Discussion contents 1, third message"
\ No newline at end of file
diff --git a/mod/forum/tests/exporters_post_test.php b/mod/forum/tests/exporters_post_test.php
index daf675a3b5e..425abc73f48 100644
--- a/mod/forum/tests/exporters_post_test.php
+++ b/mod/forum/tests/exporters_post_test.php
@@ -103,6 +103,7 @@ class mod_forum_exporters_post_testcase extends advanced_testcase {
         $canreply = true;
         $canexport = true;
         $cancontrolreadstatus = true;
+        $canreplyprivately = true;
         $capabilitymanager = new test_capability_manager(
             $canview,
             $canedit,
@@ -110,7 +111,8 @@ class mod_forum_exporters_post_testcase extends advanced_testcase {
             $cansplit,
             $canreply,
             $canexport,
-            $cancontrolreadstatus
+            $cancontrolreadstatus,
+            $canreplyprivately
         );
         $managerfactory = \mod_forum\local\container::get_manager_factory();
         $entityfactory = \mod_forum\local\container::get_entity_factory();
@@ -412,6 +414,8 @@ class test_capability_manager extends capability_manager {
     private $export;
     /** @var bool $controlreadstatus Value for can_manually_control_post_read_status */
     private $controlreadstatus;
+    /** @var bool $controlreadstatus Value for can_reply_privately_to_post */
+    private $canreplyprivatelytopost;
 
     /**
      * Constructor.
@@ -431,7 +435,8 @@ class test_capability_manager extends capability_manager {
         bool $split = true,
         bool $reply = true,
         bool $export = true,
-        bool $controlreadstatus = true
+        bool $controlreadstatus = true,
+        bool $canreplyprivatelytopost = true
     ) {
         $this->view = $view;
         $this->edit = $edit;
@@ -440,6 +445,7 @@ class test_capability_manager extends capability_manager {
         $this->reply = $reply;
         $this->export = $export;
         $this->controlreadstatus = $controlreadstatus;
+        $this->canreplyprivatelytopost = $canreplyprivatelytopost;
     }
 
     /**
@@ -522,4 +528,14 @@ class test_capability_manager extends capability_manager {
     public function can_manually_control_post_read_status(stdClass $user) : bool {
         return $this->controlreadstatus;
     }
+
+    /**
+     * Override can_reply_privately_to_post
+     * @param stdClass $user
+     * @param post_entity $post
+     * @return bool
+     */
+    public function can_reply_privately_to_post(stdClass $user, post_entity $post) : bool {
+        return $this->canreplyprivatelytopost;
+    }
 }
diff --git a/mod/forum/tests/externallib_test.php b/mod/forum/tests/externallib_test.php
index 6a1f8c281fd..3cfeb478d21 100644
--- a/mod/forum/tests/externallib_test.php
+++ b/mod/forum/tests/externallib_test.php
@@ -691,7 +691,8 @@ class mod_forum_external_testcase extends externallib_advanced_testcase {
                 'split' => 0,
                 'reply' => 1,
                 'export' => 0,
-                'controlreadstatus' => 0
+                'controlreadstatus' => 0,
+                'canreplyprivately' => 0
             ],
             'urls' => [
                 'view' => $urlfactory->get_view_post_url_from_post_id($discussion1reply2->discussion, $discussion1reply2->id),
@@ -743,7 +744,8 @@ class mod_forum_external_testcase extends externallib_advanced_testcase {
                 'split' => 0,
                 'reply' => 1,
                 'export' => 0,
-                'controlreadstatus' => 0
+                'controlreadstatus' => 0,
+                'canreplyprivately' => 0
             ],
             'urls' => [
                 'view' => $urlfactory->get_view_post_url_from_post_id($discussion1reply1->discussion, $discussion1reply1->id),