diff --git a/zerver/forms.py b/zerver/forms.py
index 996b62e1a3..f96a0a3a90 100644
--- a/zerver/forms.py
+++ b/zerver/forms.py
@@ -68,6 +68,11 @@ DEACTIVATED_ACCOUNT_ERROR = gettext_lazy(
 )
 PASSWORD_TOO_WEAK_ERROR = gettext_lazy("The password is too weak.")
 
+# Set Form.EmailField to match the default max_length on Model.EmailField,
+# can be removed when https://code.djangoproject.com/ticket/35119 is
+# completed.
+EMAIL_MAX_LENGTH = 254
+
 
 class OverridableValidationError(ValidationError):
     pass
@@ -242,7 +247,7 @@ class ToSForm(forms.Form):
 
 
 class HomepageForm(forms.Form):
-    email = forms.EmailField()
+    email = forms.EmailField(max_length=EMAIL_MAX_LENGTH)
 
     def __init__(self, *args: Any, **kwargs: Any) -> None:
         self.realm = kwargs.pop("realm", None)
@@ -321,7 +326,9 @@ class ImportRealmOwnerSelectionForm(forms.Form):
 
 class RealmCreationForm(RealmDetailsForm):
     # This form determines whether users can create a new realm.
-    email = forms.EmailField(validators=[email_not_system_bot, email_is_not_disposable])
+    email = forms.EmailField(
+        validators=[email_not_system_bot, email_is_not_disposable], max_length=EMAIL_MAX_LENGTH
+    )
     import_from = forms.ChoiceField(
         choices=PreregistrationRealm.IMPORT_FROM_CHOICES,
         required=False,
@@ -539,7 +546,7 @@ def rate_limit_password_reset_form_by_email(email: str) -> None:
 
 class CreateUserForm(forms.Form):
     full_name = forms.CharField(max_length=100)
-    email = forms.EmailField()
+    email = forms.EmailField(max_length=EMAIL_MAX_LENGTH)
 
 
 class OurAuthenticationForm(AuthenticationForm):
diff --git a/zerver/tests/test_signup.py b/zerver/tests/test_signup.py
index e78220daed..05a406fbfb 100644
--- a/zerver/tests/test_signup.py
+++ b/zerver/tests/test_signup.py
@@ -1108,6 +1108,11 @@ class LoginTest(ZulipTestCase):
         self.assertEqual(result.status_code, 200)
         self.assertContains(result, "Enter a valid email address")
 
+        invalid_email = "a" * 260 + "@example.com"
+        result = self.client_post("/accounts/home/", {"email": invalid_email}, subdomain="zulip")
+        self.assertEqual(result.status_code, 200)
+        self.assertContains(result, "Ensure this value has at most 254 characters (it has 272).")
+
     def test_register_deactivated_partway_through(self) -> None:
         """
         If you try to register for a deactivated realm, you get a clear error
@@ -4743,6 +4748,33 @@ class TestFindMyTeam(ZulipTestCase):
         result = self.client_get("/accounts/find/", {"emails": "invalid"})
         self.assertEqual(result.status_code, 200)
 
+    def test_find_team_long_email_address(self) -> None:
+        # Emails over 320 characters are considered invalid.
+        data = {"emails": "a" * 320 + "@example.com"}
+        result = self.client_post("/accounts/find/", data)
+        self.assertEqual(result.status_code, 200)
+        self.assertIn(b"Enter a valid email", result.content)
+        from django.core.mail import outbox
+
+        self.assert_length(outbox, 0)
+
+        # Emails in the database are never over 254 characters,
+        # but searching for them does not cause an error.
+        # When https://code.djangoproject.com/ticket/35119 is
+        # resolved, Django's email validator will return this
+        # case as invalid, so this test will need to be updated.
+        data = {"emails": "a" * 260 + "@example.com"}
+        result = self.client_post("/accounts/find/", data)
+        self.assertEqual(result.status_code, 200)
+        content = result.content.decode()
+        self.assertIn("Emails sent! The addresses entered on", content)
+        self.assertIn("a@example.com", content)
+        from django.core.mail import outbox
+
+        self.assert_length(outbox, 1)
+        message = outbox[0]
+        self.assertIn("Unfortunately, no Zulip Cloud accounts", message.body)
+
     def test_find_team_zero_emails(self) -> None:
         data = {"emails": ""}
         result = self.client_post("/accounts/find/", data)