diff --git a/apps/api/src/app/controllers/auth.controller.ts b/apps/api/src/app/controllers/auth.controller.ts
index 0f56b422..683fb44c 100644
--- a/apps/api/src/app/controllers/auth.controller.ts
+++ b/apps/api/src/app/controllers/auth.controller.ts
@@ -94,14 +94,14 @@ export const routeDefinition = {
             action: z.literal('login'),
             csrfToken: z.string(),
             captchaToken: z.string().nullish(),
-            email: z.string().email().min(5).max(255),
+            email: z.string().email().min(5).max(255).toLowerCase(),
             password: z.string().min(8).max(255),
           }),
           z.object({
             action: z.literal('register'),
             csrfToken: z.string(),
             captchaToken: z.string().nullish(),
-            email: z.string().email().min(5).max(255),
+            email: z.string().email().min(5).max(255).toLowerCase(),
             name: z.string().min(1).max(255).trim(),
             password: z.string().min(8).max(255),
           }),
@@ -147,7 +147,7 @@ export const routeDefinition = {
   requestPasswordReset: {
     controllerFn: () => requestPasswordReset,
     validators: {
-      body: z.object({ captchaToken: z.string().nullish(), email: z.string(), csrfToken: z.string() }),
+      body: z.object({ captchaToken: z.string().nullish(), email: z.string().toLowerCase(), csrfToken: z.string() }),
       hasSourceOrg: false,
     },
   },
@@ -155,7 +155,7 @@ export const routeDefinition = {
     controllerFn: () => validatePasswordReset,
     validators: {
       body: z.object({
-        email: z.string().email(),
+        email: z.string().email().toLowerCase(),
         token: z.string(),
         password: z.string(),
         csrfToken: z.string(),
diff --git a/apps/jetstream-e2e/src/tests/authentication/login1.spec.ts b/apps/jetstream-e2e/src/tests/authentication/login1.spec.ts
index 2375d5b0..dcdcb3e9 100644
--- a/apps/jetstream-e2e/src/tests/authentication/login1.spec.ts
+++ b/apps/jetstream-e2e/src/tests/authentication/login1.spec.ts
@@ -63,6 +63,14 @@ test.describe('Login 1', () => {
       await authenticationPage.fillOutLoginForm(email, password);
       await page.waitForURL(`**/app`);
       await expect(page.url()).toContain('/app');
+      await playwrightPage.logout();
+      await expect(page.getByTestId('home-hero-container')).toBeVisible();
+    });
+
+    await test.step('Email address should be case-insensitive', async () => {
+      await authenticationPage.fillOutLoginForm(email.toUpperCase(), password);
+      await page.waitForURL(`**/app`);
+      await expect(page.url()).toContain('/app');
     });
   });
 });
diff --git a/apps/jetstream-e2e/src/tests/authentication/login2.spec.ts b/apps/jetstream-e2e/src/tests/authentication/login2.spec.ts
index 45642adb..3ed775dd 100644
--- a/apps/jetstream-e2e/src/tests/authentication/login2.spec.ts
+++ b/apps/jetstream-e2e/src/tests/authentication/login2.spec.ts
@@ -21,7 +21,8 @@ test.describe('Login 2', () => {
     await playwrightPage.logout();
 
     await authenticationPage.goToPasswordReset();
-    await authenticationPage.fillOutResetPasswordForm(email);
+    // Use uppercase email to ensure case insensitivity
+    await authenticationPage.fillOutResetPasswordForm(email.toUpperCase());
     await expect(
       page.getByText('You will receive an email with instructions if an account exists and is eligible for password reset.')
     ).toBeVisible();
@@ -34,7 +35,10 @@ test.describe('Login 2', () => {
 
     await authenticationPage.fillOutResetPasswordVerifyForm(password, password);
 
-    await authenticationPage.loginAndVerifyEmail(email, password);
+    await expect(page.getByText('Login with your new password')).toBeVisible();
+
+    // Use uppercase email to ensure case insensitivity
+    await authenticationPage.loginAndVerifyEmail(email.toUpperCase(), password);
 
     await authenticationPage.page.waitForURL(`**/app`);
   });
diff --git a/apps/jetstream-e2e/src/tests/authentication/login3.spec.ts b/apps/jetstream-e2e/src/tests/authentication/login3.spec.ts
index 8beb1bbb..c91c17f0 100644
--- a/apps/jetstream-e2e/src/tests/authentication/login3.spec.ts
+++ b/apps/jetstream-e2e/src/tests/authentication/login3.spec.ts
@@ -59,5 +59,10 @@ test.describe('Login 3', () => {
       await authenticationPage.fillOutSignUpForm(email, 'test person', password, password);
       await expect(page.getByText('This email is already registered.')).toBeVisible();
     });
+
+    await test.step('Attempt to register with same email address, using email with uppercase', async () => {
+      await authenticationPage.fillOutSignUpForm(email.toUpperCase(), 'test person', password, password);
+      await expect(page.getByText('This email is already registered.')).toBeVisible();
+    });
   });
 });
diff --git a/apps/jetstream-e2e/src/utils/database-validation.utils.ts b/apps/jetstream-e2e/src/utils/database-validation.utils.ts
index 1734859b..13e7dd00 100644
--- a/apps/jetstream-e2e/src/utils/database-validation.utils.ts
+++ b/apps/jetstream-e2e/src/utils/database-validation.utils.ts
@@ -2,18 +2,22 @@ import { prisma } from '@jetstream/api-config';
 import { SessionData } from '@jetstream/auth/types';
 
 export async function verifyEmailLogEntryExists(email: string, subject: string) {
+  email = email.toLowerCase();
   await prisma.emailActivity.findFirstOrThrow({ where: { email, subject: { contains: subject } } });
 }
 
 export async function getPasswordResetToken(email: string) {
+  email = email.toLowerCase();
   return await prisma.passwordResetToken.findFirst({ where: { email, expiresAt: { gt: new Date() } } });
 }
 
 export async function hasPasswordResetToken(email: string, token: string) {
+  email = email.toLowerCase();
   return (await prisma.passwordResetToken.count({ where: { email, token } })) > 0;
 }
 
 export async function getUserSessionByEmail(email: string) {
+  email = email.toLowerCase();
   const session = await prisma.sessions.findFirstOrThrow({
     where: {
       sess: {
diff --git a/libs/auth/server/src/lib/auth.db.service.ts b/libs/auth/server/src/lib/auth.db.service.ts
index 5dccddda..766687ef 100644
--- a/libs/auth/server/src/lib/auth.db.service.ts
+++ b/libs/auth/server/src/lib/auth.db.service.ts
@@ -78,6 +78,7 @@ async function findUserByProviderId(provider: OauthProviderType, providerAccount
 }
 
 async function findUsersByEmail(email: string) {
+  email = email.toLowerCase();
   return prisma.user.findMany({
     select: userSelect,
     where: { email },
@@ -384,6 +385,7 @@ export async function setPasswordForUser(id: string, password: string) {
 }
 
 export const generatePasswordResetToken = async (email: string) => {
+  email = email.toLowerCase();
   // NOTE: There could be duplicate users with the same email, but only one with a password set
   // These users were migrated from Auth0, but we do not support this as a standard path
   const user = await prisma.user.findMany({
@@ -422,6 +424,7 @@ export const generatePasswordResetToken = async (email: string) => {
 };
 
 export const resetUserPassword = async (email: string, token: string, password: string) => {
+  email = email.toLowerCase();
   // if there is an existing token, delete it
   const restToken = await prisma.passwordResetToken.findUnique({
     where: { email_token: { email, token } },
@@ -478,6 +481,7 @@ export const removePasswordFromUser = async (id: string) => {
 };
 
 async function getUserAndVerifyPassword(email: string, password: string) {
+  email = email.toLowerCase();
   const UNSAFE_userWithPassword = await prisma.user.findFirst({
     select: { id: true, password: true },
     where: { email, password: { not: null } },
@@ -515,6 +519,7 @@ async function getUserAndVerifyPassword(email: string, password: string) {
 }
 
 async function migratePasswordFromAuth0(email: string, password: string) {
+  email = email.toLowerCase();
   // If the user has a linked social identity, we have no way to confirm 100% that this is the correct account
   // since we allowed same email on multiple accounts with Auth0
   const userWithoutSocialIdentities = await prisma.user.findFirst({
@@ -590,10 +595,11 @@ export async function removeIdentityFromUser(userId: string, provider: OauthProv
 }
 
 async function createUserFromProvider(providerUser: ProviderUser, provider: OauthProviderType) {
+  const email = providerUser.email?.toLowerCase();
   return prisma.user.create({
     select: userSelect,
     data: {
-      email: providerUser.email,
+      email,
       // TODO: do we really get any benefit from storing this userId like this?
       // TODO: only reason I can think of is user migration since the id is a UUID so we need to different identifier
       // TODO: this is nice as we can identify which identity is primary without joining the identity table - but could solve in other ways
@@ -608,7 +614,7 @@ async function createUserFromProvider(providerUser: ProviderUser, provider: Oaut
           type: 'oauth',
           provider: provider,
           providerAccountId: providerUser.id,
-          email: providerUser.email,
+          email,
           name: providerUser.name,
           emailVerified: providerUser.emailVerified,
           username: providerUser.username,
@@ -630,6 +636,7 @@ async function createUserFromProvider(providerUser: ProviderUser, provider: Oaut
 
 async function updateIdentityAttributesFromProvider(userId: string, providerUser: ProviderUser, provider: OauthProviderType) {
   try {
+    const email = providerUser.email?.toLowerCase();
     const existingProfile = await prisma.authIdentity.findUniqueOrThrow({
       select: {
         isPrimary: true,
@@ -650,7 +657,7 @@ async function updateIdentityAttributesFromProvider(userId: string, providerUser
     });
 
     const skipUpdate =
-      existingProfile.email === providerUser.email &&
+      existingProfile.email === email &&
       existingProfile.name === providerUser.name &&
       existingProfile.emailVerified === providerUser.emailVerified &&
       existingProfile.username === providerUser.username &&
@@ -672,7 +679,7 @@ async function updateIdentityAttributesFromProvider(userId: string, providerUser
               data: {
                 provider: provider,
                 providerAccountId: providerUser.id,
-                email: providerUser.email,
+                email,
                 name: providerUser.name,
                 emailVerified: providerUser.emailVerified,
                 username: providerUser.username,
@@ -695,7 +702,7 @@ async function updateIdentityAttributesFromProvider(userId: string, providerUser
         data: {
           provider: provider,
           providerAccountId: providerUser.id,
-          email: providerUser.email,
+          email,
           name: providerUser.name,
           emailVerified: providerUser.emailVerified,
           username: providerUser.username,
@@ -715,6 +722,7 @@ async function updateIdentityAttributesFromProvider(userId: string, providerUser
 }
 
 async function createUserFromUserInfo(email: string, name: string, password: string) {
+  email = email.toLowerCase();
   const passwordHash = await hashPassword(password);
   return prisma.$transaction(async (tx) => {
     // Create initial user
@@ -831,7 +839,9 @@ export async function handleSignInOrRegistration(
         isNewUser = true;
       }
     } else if (providerType === 'credentials') {
-      const { action, email, password } = payload;
+      const { action, password } = payload;
+      const email = payload.email.toLowerCase();
+
       if (!password) {
         throw new InvalidCredentials();
       }