diff --git a/app/assets/javascripts/due_date_select.js b/app/assets/javascripts/due_date_select.js
index fdbb4644971..db10b383913 100644
--- a/app/assets/javascripts/due_date_select.js
+++ b/app/assets/javascripts/due_date_select.js
@@ -132,7 +132,7 @@ class DueDateSelect {
         const selectedDateValue = this.datePayload[this.abilityName].due_date;
         const displayedDateStyle = this.displayedDate !== 'No due date' ? 'bold' : 'no-value';
 
-        this.$loading.fadeIn();
+        this.$loading.removeClass('hidden').fadeIn();
 
         if (isDropdown) {
           this.$dropdown.trigger('loading.gl.dropdown');
diff --git a/app/assets/javascripts/labels_select.js b/app/assets/javascripts/labels_select.js
index c648a0f076c..443fb3e0ca9 100644
--- a/app/assets/javascripts/labels_select.js
+++ b/app/assets/javascripts/labels_select.js
@@ -76,7 +76,7 @@
           if (!selected.length) {
             data[abilityName].label_ids = [''];
           }
-          $loading.fadeIn();
+          $loading.removeClass('hidden').fadeIn();
           $dropdown.trigger('loading.gl.dropdown');
           return $.ajax({
             type: 'PUT',
diff --git a/app/assets/javascripts/milestone_select.js b/app/assets/javascripts/milestone_select.js
index 02ff6f5682c..40e977df693 100644
--- a/app/assets/javascripts/milestone_select.js
+++ b/app/assets/javascripts/milestone_select.js
@@ -159,7 +159,7 @@
               }
 
               $dropdown.trigger('loading.gl.dropdown');
-              $loading.fadeIn();
+              $loading.removeClass('hidden').fadeIn();
 
               gl.issueBoards.BoardsStore.detail.issue.update($dropdown.attr('data-issue-update'))
                 .then(function () {
@@ -171,7 +171,7 @@
               data = {};
               data[abilityName] = {};
               data[abilityName].milestone_id = selected != null ? selected : null;
-              $loading.fadeIn();
+              $loading.removeClass('hidden').fadeIn();
               $dropdown.trigger('loading.gl.dropdown');
               return $.ajax({
                 type: 'PUT',
diff --git a/app/assets/javascripts/users_select.js b/app/assets/javascripts/users_select.js
index c7a57b47834..eb897e9dfe9 100644
--- a/app/assets/javascripts/users_select.js
+++ b/app/assets/javascripts/users_select.js
@@ -53,7 +53,7 @@
           $loading = $block.find('.block-loading').fadeOut();
 
           var updateIssueBoardsIssue = function () {
-            $loading.fadeIn();
+            $loading.removeClass('hidden').fadeIn();
             gl.issueBoards.BoardsStore.detail.issue.update($dropdown.attr('data-issue-update'))
               .then(function () {
                 $loading.fadeOut();
@@ -90,7 +90,7 @@
             data = {};
             data[abilityName] = {};
             data[abilityName].assignee_id = selected != null ? selected : null;
-            $loading.fadeIn();
+            $loading.removeClass('hidden').fadeIn();
             $dropdown.trigger('loading.gl.dropdown');
             return $.ajax({
               type: 'PUT',
diff --git a/app/views/shared/issuable/_sidebar.html.haml b/app/views/shared/issuable/_sidebar.html.haml
index 048fc488207..25a4aec0a38 100644
--- a/app/views/shared/issuable/_sidebar.html.haml
+++ b/app/views/shared/issuable/_sidebar.html.haml
@@ -30,7 +30,7 @@
             = icon('user', 'aria-hidden': 'true')
         .title.hide-collapsed
           Assignee
-          = icon('spinner spin', class: 'block-loading', 'aria-hidden': 'true')
+          = icon('spinner spin', class: 'hidden block-loading', 'aria-hidden': 'true')
           - if can_edit_issuable
             = link_to 'Edit', '#', class: 'edit-link pull-right'
         .value.hide-collapsed
@@ -64,7 +64,7 @@
               None
         .title.hide-collapsed
           Milestone
-          = icon('spinner spin', class: 'block-loading', 'aria-hidden': 'true')
+          = icon('spinner spin', class: 'hidden block-loading', 'aria-hidden': 'true')
           - if can_edit_issuable
             = link_to 'Edit', '#', class: 'edit-link pull-right'
         .value.hide-collapsed
@@ -91,7 +91,7 @@
               = issuable.due_date.try(:to_s, :medium) || 'None'
           .title.hide-collapsed
             Due date
-            = icon('spinner spin', class: 'block-loading', 'aria-hidden': 'true')
+            = icon('spinner spin', class: 'hidden block-loading', 'aria-hidden': 'true')
             - if can?(current_user, :"admin_#{issuable.to_ability_name}", @project)
               = link_to 'Edit', '#', class: 'edit-link pull-right'
           .value.hide-collapsed
@@ -121,12 +121,12 @@
         - selected_labels = issuable.labels
         .block.labels
           .sidebar-collapsed-icon.js-sidebar-labels-tooltip{ title: issuable_labels_tooltip(issuable.labels_array), data: { placement: "left", container: "body" } }
-            = icon('tags', 'aria-hidden': 'true')
+            = icon('tags', class: 'hidden', 'aria-hidden': 'true')
             %span
               = selected_labels.size
           .title.hide-collapsed
             Labels
-            = icon('spinner spin', class: 'block-loading', 'aria-hidden': 'true')
+            = icon('spinner spin', class: 'hidden block-loading', 'aria-hidden': 'true')
             - if can_edit_issuable
               = link_to 'Edit', '#', class: 'edit-link pull-right'
           .value.issuable-show-labels.hide-collapsed{ class: ("has-labels" if selected_labels.any?) }
diff --git a/changelogs/unreleased/24683-sidebar-spinners.yml b/changelogs/unreleased/24683-sidebar-spinners.yml
new file mode 100644
index 00000000000..3fec273152f
--- /dev/null
+++ b/changelogs/unreleased/24683-sidebar-spinners.yml
@@ -0,0 +1,4 @@
+---
+title: hide loading spinners for server-rendered sidebar fields
+merge_request:
+author: