diff --git a/prisma/migrations/20240622123027_quiz_notes/migration.sql b/prisma/migrations/20240622123027_quiz_notes/migration.sql
new file mode 100644
index 0000000..cac2150
--- /dev/null
+++ b/prisma/migrations/20240622123027_quiz_notes/migration.sql
@@ -0,0 +1,19 @@
+-- CreateEnum
+CREATE TYPE "QuizNoteType" AS ENUM ('ILLEGIBLE');
+
+-- CreateTable
+CREATE TABLE "quiz_note" (
+    "id" TEXT NOT NULL,
+    "quiz_id" TEXT NOT NULL,
+    "user_id" TEXT NOT NULL,
+    "note_type" "QuizNoteType" NOT NULL,
+    "submitted_at" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "quiz_note_pkey" PRIMARY KEY ("id")
+);
+
+-- AddForeignKey
+ALTER TABLE "quiz_note" ADD CONSTRAINT "quiz_note_quiz_id_fkey" FOREIGN KEY ("quiz_id") REFERENCES "quiz"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "quiz_note" ADD CONSTRAINT "quiz_note_user_id_fkey" FOREIGN KEY ("user_id") REFERENCES "user"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index 332381d..1eed829 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -30,6 +30,7 @@ model Quiz {
 
   completions    QuizCompletion[]
   images         QuizImage[]
+  notes          QuizNote[]
   uploadedByUser User             @relation(fields: [uploadedByUserId], references: [id])
 
   @@unique(fields: [date, type])
@@ -79,6 +80,19 @@ model QuizCompletionUser {
   @@map("quiz_completion_user")
 }
 
+model QuizNote {
+  id          String       @id
+  quizId      String       @map("quiz_id")
+  userId      String       @map("user_id")
+  noteType    QuizNoteType @map("note_type")
+  submittedAt DateTime     @map("submitted_at")
+
+  quiz Quiz @relation(fields: [quizId], references: [id])
+  user User @relation(fields: [userId], references: [id])
+
+  @@map("quiz_note")
+}
+
 model User {
   id    String  @id
   email String
@@ -86,11 +100,16 @@ model User {
 
   roles           UserRole[]
   quizCompletions QuizCompletionUser[]
+  quizNotes       QuizNote[]
   uploadedQuizzes Quiz[]
 
   @@map("user")
 }
 
+enum QuizNoteType {
+  ILLEGIBLE
+}
+
 enum Role {
   USER
   ADMIN
diff --git a/src/gql.ts b/src/gql.ts
index 4578759..fe8122b 100644
--- a/src/gql.ts
+++ b/src/gql.ts
@@ -128,6 +128,17 @@ const typeDefs = gql`
     averageScorePercentage: Float!
   }
 
+  enum ExcludeIllegibleOptions {
+    """
+    Exclude quizzes that have been marked as illegible by me.
+    """
+    ME
+    """
+    Exclude quizzes that have been marked as illegible by anyone.
+    """
+    ANYONE
+  }
+
   "Available filters for the quizzes query"
   input QuizFilters {
     """
@@ -135,6 +146,10 @@ const typeDefs = gql`
     If provided, only quizzes completed by none of these users will be included in the results.
     """
     excludeCompletedBy: [String]
+    """
+    Optional option to exclude quizzes that have been marked as illegible.
+    """
+    excludeIllegible: ExcludeIllegibleOptions
   }
 
   type Query {
@@ -171,6 +186,7 @@ const typeDefs = gql`
   type Mutation {
     createQuiz(type: QuizType!, date: Date!, files: [CreateQuizFile]): CreateQuizResult
     completeQuiz(quizId: String!, completedBy: [String]!, score: Float!): CompleteQuizResult
+    markQuizIllegible(quizId: String!): Boolean
   }
 `;
 
diff --git a/src/quiz/quiz.dto.ts b/src/quiz/quiz.dto.ts
index 9c6007e..a9eaa4d 100644
--- a/src/quiz/quiz.dto.ts
+++ b/src/quiz/quiz.dto.ts
@@ -37,6 +37,7 @@ export interface QuizDetails {
 
 export interface QuizFilters {
   excludeCompletedBy?: string[];
+  excludeIllegible?: 'ME' | 'ANYONE';
 }
 
 export interface CreateQuizResult {
diff --git a/src/quiz/quiz.gql.ts b/src/quiz/quiz.gql.ts
index 1f663f5..435a3ea 100644
--- a/src/quiz/quiz.gql.ts
+++ b/src/quiz/quiz.gql.ts
@@ -58,6 +58,16 @@ async function completeQuiz(
   });
 }
 
+async function markQuizIllegible(
+  _: unknown,
+  { quizId }: { quizId: string },
+  context: QuizlordContext,
+): Promise<boolean> {
+  authorisationService.requireUserRole(context, 'USER');
+  quizService.markQuizIllegible(quizId, context.email);
+  return true;
+}
+
 export const quizQueries = {
   quizzes,
   quiz,
@@ -65,4 +75,5 @@ export const quizQueries = {
 export const quizMutations = {
   createQuiz,
   completeQuiz,
+  markQuizIllegible,
 };
diff --git a/src/quiz/quiz.persistence.ts b/src/quiz/quiz.persistence.ts
index 1463a8f..d090637 100644
--- a/src/quiz/quiz.persistence.ts
+++ b/src/quiz/quiz.persistence.ts
@@ -1,4 +1,5 @@
-import { Quiz, QuizImage } from '@prisma/client';
+import { Quiz, QuizImage, QuizNoteType } from '@prisma/client';
+import { v4 as uuidv4 } from 'uuid';
 
 import { PrismaService } from '../database/prisma.service';
 import { QuizFilters } from './quiz.dto';
@@ -70,6 +71,23 @@ export class QuizPersistence {
             },
           },
         }),
+        ...(filters.excludeIllegible === 'ME' && {
+          notes: {
+            none: {
+              noteType: 'ILLEGIBLE',
+              user: {
+                email: userEmail,
+              },
+            },
+          },
+        }),
+        ...(filters.excludeIllegible === 'ANYONE' && {
+          notes: {
+            none: {
+              noteType: 'ILLEGIBLE',
+            },
+          },
+        }),
       },
     });
 
@@ -205,4 +223,37 @@ export class QuizPersistence {
     });
     return slicePagedResults(result, limit, afterId !== undefined);
   }
+
+  async addQuizNote({
+    quizId,
+    noteType,
+    userEmail,
+    submittedAt,
+  }: {
+    quizId: string;
+    noteType: QuizNoteType;
+    userEmail: string;
+    submittedAt: Date;
+  }) {
+    const user = await this.#prisma.client().user.findFirst({
+      where: {
+        email: userEmail,
+      },
+    });
+
+    if (!user) {
+      throw new Error(`Unable to find user with email ${userEmail}`);
+    }
+
+    const noteId = uuidv4();
+    await this.#prisma.client().quizNote.create({
+      data: {
+        id: noteId,
+        noteType,
+        quizId,
+        userId: user.id,
+        submittedAt,
+      },
+    });
+  }
 }
diff --git a/src/quiz/quiz.service.ts b/src/quiz/quiz.service.ts
index 6b4379e..e7154c8 100644
--- a/src/quiz/quiz.service.ts
+++ b/src/quiz/quiz.service.ts
@@ -276,4 +276,12 @@ export class QuizService {
       },
     };
   }
+  async markQuizIllegible(quizId: string, userEmail: string): Promise<void> {
+    await this.#persistence.addQuizNote({
+      quizId,
+      noteType: 'ILLEGIBLE',
+      submittedAt: new Date(),
+      userEmail,
+    });
+  }
 }