diff --git a/site/src/api/queries/workspaces.ts b/site/src/api/queries/workspaces.ts
new file mode 100644
index 0000000000000..8e11409b49d62
--- /dev/null
+++ b/site/src/api/queries/workspaces.ts
@@ -0,0 +1,22 @@
+import * as API from "api/api";
+import { type QueryOptions } from "react-query";
+import {
+  type WorkspacesResponse,
+  type WorkspacesRequest,
+} from "api/typesGenerated";
+
+export function workspacesKey(config: WorkspacesRequest = {}) {
+  const { q, limit } = config;
+  return ["workspaces", { q, limit }] as const;
+}
+
+export function workspaces(config: WorkspacesRequest = {}) {
+  // Duplicates some of the work from workspacesKey, but that felt better than
+  // letting invisible properties sneak into the query logic
+  const { q, limit } = config;
+
+  return {
+    queryKey: workspacesKey(config),
+    queryFn: () => API.getWorkspaces({ q, limit }),
+  } as const satisfies QueryOptions<WorkspacesResponse>;
+}
diff --git a/site/src/pages/TemplatePage/TemplatePageHeader.tsx b/site/src/pages/TemplatePage/TemplatePageHeader.tsx
index 3985306a97548..ec2bae83bd852 100644
--- a/site/src/pages/TemplatePage/TemplatePageHeader.tsx
+++ b/site/src/pages/TemplatePage/TemplatePageHeader.tsx
@@ -1,114 +1,178 @@
-import Button from "@mui/material/Button";
-import AddIcon from "@mui/icons-material/AddOutlined";
+import { type FC, useRef, useState } from "react";
+import { Link as RouterLink, useNavigate } from "react-router-dom";
+import { useDeletionDialogState } from "./useDeletionDialogState";
+
+import { useQuery } from "react-query";
+import { workspaces } from "api/queries/workspaces";
+import { ConfirmDialog } from "components/Dialogs/ConfirmDialog/ConfirmDialog";
 import {
   AuthorizationResponse,
   Template,
   TemplateVersion,
 } from "api/typesGenerated";
+
 import { Avatar } from "components/Avatar/Avatar";
 import { DeleteDialog } from "components/Dialogs/DeleteDialog/DeleteDialog";
+import { Stack } from "components/Stack/Stack";
+import { Margins } from "components/Margins/Margins";
 import {
   PageHeader,
   PageHeaderTitle,
   PageHeaderSubtitle,
 } from "components/PageHeader/PageHeader";
-import { Stack } from "components/Stack/Stack";
-import { FC, useRef, useState } from "react";
-import { Link as RouterLink, useNavigate } from "react-router-dom";
-import { useDeleteTemplate } from "./deleteTemplate";
-import { Margins } from "components/Margins/Margins";
+
+import Button from "@mui/material/Button";
 import MoreVertOutlined from "@mui/icons-material/MoreVertOutlined";
 import Menu from "@mui/material/Menu";
 import MenuItem from "@mui/material/MenuItem";
-import SettingsOutlined from "@mui/icons-material/SettingsOutlined";
-import DeleteOutlined from "@mui/icons-material/DeleteOutlined";
-import EditOutlined from "@mui/icons-material/EditOutlined";
-import FileCopyOutlined from "@mui/icons-material/FileCopyOutlined";
 import IconButton from "@mui/material/IconButton";
+import AddIcon from "@mui/icons-material/AddOutlined";
+import SettingsIcon from "@mui/icons-material/SettingsOutlined";
+import DeleteIcon from "@mui/icons-material/DeleteOutlined";
+import EditIcon from "@mui/icons-material/EditOutlined";
+import CopyIcon from "@mui/icons-material/FileCopyOutlined";
 
-const TemplateMenu: FC<{
+type TemplateMenuProps = {
   templateName: string;
   templateVersion: string;
+  templateId: string;
   onDelete: () => void;
-}> = ({ templateName, templateVersion, onDelete }) => {
+};
+
+const TemplateMenu: FC<TemplateMenuProps> = ({
+  templateName,
+  templateVersion,
+  templateId,
+  onDelete,
+}) => {
+  const dialogState = useDeletionDialogState(templateId, onDelete);
   const menuTriggerRef = useRef<HTMLButtonElement>(null);
   const [isMenuOpen, setIsMenuOpen] = useState(false);
   const navigate = useNavigate();
 
+  const queryText = `template:${templateName}`;
+  const workspaceCountQuery = useQuery({
+    ...workspaces({ q: queryText }),
+    select: (res) => res.count,
+  });
+
   // Returns a function that will execute the action and close the menu
   const onMenuItemClick = (actionFn: () => void) => () => {
     setIsMenuOpen(false);
-
     actionFn();
   };
 
+  const safeToDeleteTemplate = workspaceCountQuery.data === 0;
+
   return (
-    <div>
-      <IconButton
-        aria-controls="template-options"
-        aria-haspopup="true"
-        onClick={() => setIsMenuOpen(true)}
-        ref={menuTriggerRef}
-        arial-label="More options"
-      >
-        <MoreVertOutlined />
-      </IconButton>
-
-      <Menu
-        id="template-options"
-        anchorEl={menuTriggerRef.current}
-        open={isMenuOpen}
-        onClose={() => setIsMenuOpen(false)}
-      >
-        <MenuItem
-          onClick={onMenuItemClick(() =>
-            navigate(`/templates/${templateName}/settings`),
-          )}
+    <>
+      <div>
+        <IconButton
+          aria-controls="template-options"
+          aria-haspopup="true"
+          onClick={() => setIsMenuOpen(true)}
+          ref={menuTriggerRef}
+          arial-label="More options"
         >
-          <SettingsOutlined />
-          Settings
-        </MenuItem>
-        <MenuItem
-          onClick={onMenuItemClick(() =>
-            navigate(
-              `/templates/${templateName}/versions/${templateVersion}/edit`,
-            ),
-          )}
-        >
-          <EditOutlined />
-          Edit files
-        </MenuItem>
-        <MenuItem
-          onClick={onMenuItemClick(() =>
-            navigate(`/templates/new?fromTemplate=${templateName}`),
-          )}
+          <MoreVertOutlined />
+        </IconButton>
+
+        <Menu
+          id="template-options"
+          anchorEl={menuTriggerRef.current}
+          open={isMenuOpen}
+          onClose={() => setIsMenuOpen(false)}
         >
-          <FileCopyOutlined />
-          Duplicate&hellip;
-        </MenuItem>
-        <MenuItem onClick={onMenuItemClick(onDelete)}>
-          <DeleteOutlined />
-          Delete&hellip;
-        </MenuItem>
-      </Menu>
-    </div>
+          <MenuItem
+            onClick={onMenuItemClick(() =>
+              navigate(`/templates/${templateName}/settings`),
+            )}
+          >
+            <SettingsIcon />
+            Settings
+          </MenuItem>
+
+          <MenuItem
+            onClick={onMenuItemClick(() =>
+              navigate(
+                `/templates/${templateName}/versions/${templateVersion}/edit`,
+              ),
+            )}
+          >
+            <EditIcon />
+            Edit files
+          </MenuItem>
+
+          <MenuItem
+            onClick={onMenuItemClick(() =>
+              navigate(`/templates/new?fromTemplate=${templateName}`),
+            )}
+          >
+            <CopyIcon />
+            Duplicate&hellip;
+          </MenuItem>
+
+          <MenuItem
+            onClick={onMenuItemClick(dialogState.openDeleteConfirmation)}
+          >
+            <DeleteIcon />
+            Delete&hellip;
+          </MenuItem>
+        </Menu>
+      </div>
+
+      {safeToDeleteTemplate ? (
+        <DeleteDialog
+          isOpen={dialogState.isDeleteDialogOpen}
+          onConfirm={dialogState.confirmDelete}
+          onCancel={dialogState.cancelDeleteConfirmation}
+          entity="template"
+          name={templateName}
+        />
+      ) : (
+        <ConfirmDialog
+          type="info"
+          title="Unable to delete"
+          hideCancel={false}
+          open={dialogState.isDeleteDialogOpen}
+          onClose={dialogState.cancelDeleteConfirmation}
+          confirmText="See workspaces"
+          confirmLoading={workspaceCountQuery.status !== "success"}
+          onConfirm={() => {
+            navigate({
+              pathname: "/workspaces",
+              search: new URLSearchParams({ filter: queryText }).toString(),
+            });
+          }}
+          description={
+            <>
+              {workspaceCountQuery.isSuccess && (
+                <>
+                  This template is used by{" "}
+                  <strong>
+                    {workspaceCountQuery.data} workspace
+                    {workspaceCountQuery.data === 1 ? "" : "s"}
+                  </strong>
+                  . Please delete all related workspaces before deleting this
+                  template.
+                </>
+              )}
+
+              {workspaceCountQuery.isLoading && (
+                <>Loading information about workspaces used by this template.</>
+              )}
+
+              {workspaceCountQuery.isError && (
+                <>Unable to determine workspaces used by this template.</>
+              )}
+            </>
+          }
+        />
+      )}
+    </>
   );
 };
 
-const CreateWorkspaceButton: FC<{
-  templateName: string;
-  className?: string;
-}> = ({ templateName }) => (
-  <Button
-    variant="contained"
-    startIcon={<AddIcon />}
-    component={RouterLink}
-    to={`/templates/${templateName}/workspace`}
-  >
-    Create Workspace
-  </Button>
-);
-
 export type TemplatePageHeaderProps = {
   template: Template;
   activeVersion: TemplateVersion;
@@ -123,19 +187,27 @@ export const TemplatePageHeader: FC<TemplatePageHeaderProps> = ({
   onDeleteTemplate,
 }) => {
   const hasIcon = template.icon && template.icon !== "";
-  const deleteTemplate = useDeleteTemplate(template, onDeleteTemplate);
 
   return (
     <Margins>
       <PageHeader
         actions={
           <>
-            <CreateWorkspaceButton templateName={template.name} />
+            <Button
+              variant="contained"
+              startIcon={<AddIcon />}
+              component={RouterLink}
+              to={`/templates/${template.name}/workspace`}
+            >
+              Create Workspace
+            </Button>
+
             {permissions.canUpdateTemplate && (
               <TemplateMenu
                 templateVersion={activeVersion.name}
                 templateName={template.name}
-                onDelete={deleteTemplate.openDeleteConfirmation}
+                templateId={template.id}
+                onDelete={onDeleteTemplate}
               />
             )}
           </>
@@ -154,6 +226,7 @@ export const TemplatePageHeader: FC<TemplatePageHeaderProps> = ({
                 ? template.display_name
                 : template.name}
             </PageHeaderTitle>
+
             {template.description !== "" && (
               <PageHeaderSubtitle condensed>
                 {template.description}
@@ -162,15 +235,6 @@ export const TemplatePageHeader: FC<TemplatePageHeaderProps> = ({
           </div>
         </Stack>
       </PageHeader>
-
-      <DeleteDialog
-        isOpen={deleteTemplate.isDeleteDialogOpen}
-        confirmLoading={deleteTemplate.state.status === "deleting"}
-        onConfirm={deleteTemplate.confirmDelete}
-        onCancel={deleteTemplate.cancelDeleteConfirmation}
-        entity="template"
-        name={template.name}
-      />
     </Margins>
   );
 };
diff --git a/site/src/pages/TemplatePage/deleteTemplate.test.ts b/site/src/pages/TemplatePage/useDeletionDialogState.test.ts
similarity index 83%
rename from site/src/pages/TemplatePage/deleteTemplate.test.ts
rename to site/src/pages/TemplatePage/useDeletionDialogState.test.ts
index fc4a4076d2852..1858520bff06f 100644
--- a/site/src/pages/TemplatePage/deleteTemplate.test.ts
+++ b/site/src/pages/TemplatePage/useDeletionDialogState.test.ts
@@ -1,11 +1,11 @@
 import { act, renderHook, waitFor } from "@testing-library/react";
 import { MockTemplate } from "testHelpers/entities";
-import { useDeleteTemplate } from "./deleteTemplate";
+import { useDeletionDialogState } from "./useDeletionDialogState";
 import * as API from "api/api";
 
 test("delete dialog starts closed", () => {
   const { result } = renderHook(() =>
-    useDeleteTemplate(MockTemplate, jest.fn()),
+    useDeletionDialogState(MockTemplate.id, jest.fn()),
   );
   expect(result.current.isDeleteDialogOpen).toBeFalsy();
 });
@@ -13,7 +13,7 @@ test("delete dialog starts closed", () => {
 test("confirm template deletion", async () => {
   const onDeleteTemplate = jest.fn();
   const { result } = renderHook(() =>
-    useDeleteTemplate(MockTemplate, onDeleteTemplate),
+    useDeletionDialogState(MockTemplate.id, onDeleteTemplate),
   );
 
   //Open delete confirmation
@@ -31,7 +31,7 @@ test("confirm template deletion", async () => {
 
 test("cancel template deletion", () => {
   const { result } = renderHook(() =>
-    useDeleteTemplate(MockTemplate, jest.fn()),
+    useDeletionDialogState(MockTemplate.id, jest.fn()),
   );
 
   //Open delete confirmation
diff --git a/site/src/pages/TemplatePage/deleteTemplate.ts b/site/src/pages/TemplatePage/useDeletionDialogState.ts
similarity index 85%
rename from site/src/pages/TemplatePage/deleteTemplate.ts
rename to site/src/pages/TemplatePage/useDeletionDialogState.ts
index e8a4f1e44b153..7b3b7bbfcac63 100644
--- a/site/src/pages/TemplatePage/deleteTemplate.ts
+++ b/site/src/pages/TemplatePage/useDeletionDialogState.ts
@@ -1,15 +1,17 @@
+import { useState } from "react";
 import { deleteTemplate } from "api/api";
 import { getErrorMessage } from "api/errors";
-import { Template } from "api/typesGenerated";
 import { displayError } from "components/GlobalSnackbar/utils";
-import { useState } from "react";
 
 type DeleteTemplateState =
   | { status: "idle" }
   | { status: "confirming" }
   | { status: "deleting" };
 
-export const useDeleteTemplate = (template: Template, onDelete: () => void) => {
+export const useDeletionDialogState = (
+  templateId: string,
+  onDelete: () => void,
+) => {
   const [state, setState] = useState<DeleteTemplateState>({ status: "idle" });
   const isDeleteDialogOpen =
     state.status === "confirming" || state.status === "deleting";
@@ -25,7 +27,7 @@ export const useDeleteTemplate = (template: Template, onDelete: () => void) => {
   const confirmDelete = async () => {
     try {
       setState({ status: "deleting" });
-      await deleteTemplate(template.id);
+      await deleteTemplate(templateId);
       onDelete();
     } catch (e) {
       setState({ status: "confirming" });