diff --git a/app/controllers/prompts/collections/users_controller.rb b/app/controllers/prompts/collections/users_controller.rb
new file mode 100644
index 000000000..22c74cd58
--- /dev/null
+++ b/app/controllers/prompts/collections/users_controller.rb
@@ -0,0 +1,8 @@
+class Prompts::Collections::UsersController < ApplicationController
+  include CollectionScoped
+
+  def index
+    @users = @collection.users
+    render layout: false
+  end
+end
diff --git a/app/controllers/prompts/users_controller.rb b/app/controllers/prompts/users_controller.rb
deleted file mode 100644
index 1aaf995c4..000000000
--- a/app/controllers/prompts/users_controller.rb
+++ /dev/null
@@ -1,6 +0,0 @@
-class Prompts::UsersController < ApplicationController
-  def index
-    @users = User.all
-    render layout: false
-  end
-end
diff --git a/app/helpers/rich_text_helper.rb b/app/helpers/rich_text_helper.rb
index 42c7cf5f1..2e0b63a93 100644
--- a/app/helpers/rich_text_helper.rb
+++ b/app/helpers/rich_text_helper.rb
@@ -1,6 +1,6 @@
 module RichTextHelper
-  def mentions_prompt
-    content_tag "lexical-prompt", "", trigger: "@", src: prompts_users_path, name: "mention"
+  def mentions_prompt(collection)
+    content_tag "lexical-prompt", "", trigger: "@", src: prompts_collection_users_path(collection), name: "mention"
   end
 
   def cards_prompt
diff --git a/app/views/cards/comments/_new.html.erb b/app/views/cards/comments/_new.html.erb
index 8237fda1e..07802b0f0 100644
--- a/app/views/cards/comments/_new.html.erb
+++ b/app/views/cards/comments/_new.html.erb
@@ -11,7 +11,7 @@
                   action: "turbo:submit-end->local-save#submit keydown.ctrl+enter->form#submit:prevent keydown.meta+enter->form#submit:prevent keydown.esc->form#cancel:stop" } do |form| %>
         <%= form.rich_textarea :body, required: true, placeholder: new_comment_placeholder(card),
               data: { local_save_target: "input", action: "actiontext:change->local-save#save turbo:morph-element->local-save#restoreContent" } do %>
-          <%= mentions_prompt %>
+          <%= mentions_prompt(@card.collection) %>
           <%= cards_prompt %>
         <% end %>
         <%= form.button class: "comment__submit btn btn--reversed flex-item-justify-start" do %>
diff --git a/app/views/cards/comments/edit.html.erb b/app/views/cards/comments/edit.html.erb
index ebf55a8b1..d236e1b79 100644
--- a/app/views/cards/comments/edit.html.erb
+++ b/app/views/cards/comments/edit.html.erb
@@ -9,7 +9,7 @@
         <%= form_with model: [ @card, @comment ], class: "flex flex-column gap full-width",
               data: { controller: "form", action: "keydown.ctrl+enter->form#submit:prevent keydown.meta+enter->form#submit:prevent keydown.esc->form#cancel:stop" } do |form| %>
           <%= form.rich_textarea :body, required: true, autofocus: true, placeholder: new_comment_placeholder(@card) do %>
-            <%= mentions_prompt %>
+            <%= mentions_prompt(@card.collection) %>
             <%= cards_prompt %>
           <% end %>
           <div class="flex gap-half justify-start">
diff --git a/app/views/cards/container/_title.html.erb b/app/views/cards/container/_title.html.erb
index e95064726..fe66f6020 100644
--- a/app/views/cards/container/_title.html.erb
+++ b/app/views/cards/container/_title.html.erb
@@ -21,7 +21,7 @@
       <%= form.rich_textarea :description, class: "card-field__description",
             placeholder: "Add some notes, context, pictures, or video about this…",
             data: { action: "actiontext:change->auto-save#change focusout->auto-save#submit keydown.ctrl+enter->form#submit:prevent keydown.meta+enter->form#submit:prevent keydown.esc->form#cancel:stop" } do %>
-        <%= mentions_prompt %>
+        <%= mentions_prompt(card.collection) %>
         <%= cards_prompt %>
     <% end %>
     </div>
diff --git a/app/views/cards/edit.html.erb b/app/views/cards/edit.html.erb
index 03b1ae325..e438dbbdb 100644
--- a/app/views/cards/edit.html.erb
+++ b/app/views/cards/edit.html.erb
@@ -11,7 +11,7 @@
     <%= form.rich_textarea :description, class: "card-field__description rich-text-content",
           placeholder: "Add some notes, context, pictures, or video about this…",
           data: { action: "keydown.ctrl+enter->form#submit:prevent keydown.meta+enter->form#submit:prevent keydown.esc->form#cancel:stop" } do %>
-      <%= mentions_prompt %>
+      <%= mentions_prompt(@card.collection) %>
       <%= cards_prompt %>
     <% end %>
     </div>
diff --git a/app/views/prompts/users/_user.html.erb b/app/views/prompts/collections/users/_user.html.erb
similarity index 100%
rename from app/views/prompts/users/_user.html.erb
rename to app/views/prompts/collections/users/_user.html.erb
diff --git a/app/views/prompts/collections/users/index.html.erb b/app/views/prompts/collections/users/index.html.erb
new file mode 100644
index 000000000..3ece68eab
--- /dev/null
+++ b/app/views/prompts/collections/users/index.html.erb
@@ -0,0 +1 @@
+<%= render partial: "prompts/collections/users/user", collection: @users %>
diff --git a/app/views/prompts/users/index.html.erb b/app/views/prompts/users/index.html.erb
deleted file mode 100644
index 4d78c50f9..000000000
--- a/app/views/prompts/users/index.html.erb
+++ /dev/null
@@ -1 +0,0 @@
-<%= render partial: "prompts/users/user", collection: @users %>
diff --git a/config/routes.rb b/config/routes.rb
index 8032e842d..db0cf3cd6 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -104,8 +104,12 @@ Rails.application.routes.draw do
   end
 
   namespace :prompts do
-    resources :users
     resources :cards
+    resources :collections do
+      scope module: :collections do
+        resources :users
+      end
+    end
   end
 
   namespace :public do