diff --git a/apps/app/src/paths/AssignmentViewer.tsx b/apps/app/src/paths/AssignmentViewer.tsx
index d0c5e07a6..f769f81af 100644
--- a/apps/app/src/paths/AssignmentViewer.tsx
+++ b/apps/app/src/paths/AssignmentViewer.tsx
@@ -8,7 +8,17 @@ import {
 
 import { DoenetViewer } from "@doenet/doenetml-iframe";
 
-import { Box, Button, Grid, GridItem, Text, Tooltip } from "@chakra-ui/react";
+import {
+  Alert,
+  AlertDescription,
+  AlertIcon,
+  Box,
+  Button,
+  Grid,
+  GridItem,
+  Text,
+  Tooltip,
+} from "@chakra-ui/react";
 import axios, { AxiosError } from "axios";
 import {
   EnterClassCode,
@@ -256,6 +266,10 @@ export function AssignmentViewer() {
     throw Error("User should have been defined");
   }
 
+  const isAnonymous = user.isAnonymous === true;
+  const anonymousBannerHeight = "40px";
+  const headerHeight = isAnonymous ? "120px" : "80px";
+
   const [attemptNumber, setAttemptNumber] = useState<number>(
     loaderData.attemptNumber,
   );
@@ -565,8 +579,6 @@ export function AssignmentViewer() {
   const baseUrl = window.location.protocol + "//" + window.location.host;
   const doenetViewerUrl = `${baseUrl}/activityViewer`;
 
-  const headerHeight = "80px";
-
   let viewer: ReactElement<any>;
   if (loaderData.type === "singleDoc") {
     const maxAttempts = assignment.assignmentInfo?.maxAttempts ?? 0;
@@ -698,6 +710,25 @@ export function AssignmentViewer() {
         </Grid>
       </GridItem>
 
+      {isAnonymous && (
+        <Box
+          position="fixed"
+          top="80px"
+          height={anonymousBannerHeight}
+          width="100%"
+          zIndex="500"
+          data-test="Anonymous User Banner"
+        >
+          <Alert status="warning" height={anonymousBannerHeight}>
+            <AlertIcon />
+            <AlertDescription>
+              You are logged in as an anonymous user. Your work is saved in this
+              browser only and may be lost if you clear your browser data.
+            </AlertDescription>
+          </Alert>
+        </Box>
+      )}
+
       <GridItem
         area="centerContent"
         height={`calc(100vh - ${headerHeight})`}
diff --git a/packages/e2e-tests/e2e/Assignments/assignmentWorkflow.cy.ts b/packages/e2e-tests/e2e/Assignments/assignmentWorkflow.cy.ts
index 196ab23bc..cde85bf49 100644
--- a/packages/e2e-tests/e2e/Assignments/assignmentWorkflow.cy.ts
+++ b/packages/e2e-tests/e2e/Assignments/assignmentWorkflow.cy.ts
@@ -519,4 +519,55 @@ describe("Assignment workflow Tests", function () {
       });
     },
   );
+
+  it(
+    "Anonymous user sees banner; non-anonymous user does not",
+    { tags: ["@group1"] },
+    () => {
+      const code = Date.now().toString();
+      const instructorEmail = `test${code}@doenet.org`;
+      cy.loginAsTestUser({
+        isAuthor: true,
+        email: instructorEmail,
+        firstNames: "Instructor",
+        lastNames: "One",
+      });
+
+      let classCode: number | null = null;
+
+      cy.createContent({
+        name: "Test Assignment",
+        contentType: "singleDoc",
+        doenetML: `<p>Hello world</p>`,
+      }).then((contentId) => {
+        cy.createAssignment({
+          contentId,
+          closedOn: DateTime.now().plus({ days: 7 }).toISO(),
+        }).then(({ classCode: cc }) => {
+          classCode = cc;
+        });
+      });
+
+      // Anonymous user sees the banner
+      cy.loginAsTestUser({ isAnonymous: true });
+
+      cy.then(() => {
+        cy.visit(`/code/${classCode}`);
+        cy.get('[data-test="Anonymous User Banner"]').should("be.visible");
+        cy.contains("anonymous user").should("be.visible");
+      });
+
+      // Non-anonymous user does not see the banner
+      cy.loginAsTestUser({
+        email: instructorEmail,
+        firstNames: "Instructor",
+        lastNames: "One",
+      });
+
+      cy.then(() => {
+        cy.visit(`/code/${classCode}`);
+        cy.get('[data-test="Anonymous User Banner"]').should("not.exist");
+      });
+    },
+  );
 });