diff --git a/csm_web/scheduler/migrations/0033_alter_user_email.py b/csm_web/scheduler/migrations/0033_alter_user_email.py
new file mode 100644
index 00000000..35ad65d1
--- /dev/null
+++ b/csm_web/scheduler/migrations/0033_alter_user_email.py
@@ -0,0 +1,19 @@
+# Generated by Django 3.2.15 on 2023-02-03 01:55
+
+from django.db import migrations
+import scheduler.models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('scheduler', '0032_word_of_the_day'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='user',
+            name='email',
+            field=scheduler.models.LowercaseEmailField(max_length=254, unique=True),
+        ),
+    ]
diff --git a/csm_web/scheduler/models.py b/csm_web/scheduler/models.py
index 828a50fa..7ca21a69 100644
--- a/csm_web/scheduler/models.py
+++ b/csm_web/scheduler/models.py
@@ -34,8 +34,21 @@ def week_bounds(date):
     return week_start, week_end
 
 
+class LowercaseEmailField(models.EmailField):
+    """
+    Override EmailField to convert emails to lowercase before saving.
+    """
+
+    def to_python(self, value):
+        value = super(LowercaseEmailField, self).to_python(value)
+        if isinstance(value, str):
+            return value.lower()
+        return value
+
+
 class User(AbstractUser):
     priority_enrollment = models.DateTimeField(null=True, blank=True)
+    email = LowercaseEmailField(unique=True)
 
     def can_enroll_in_course(self, course, bypass_enrollment_time=False):
         # check restricted first
diff --git a/csm_web/scheduler/tests/models/test_user.py b/csm_web/scheduler/tests/models/test_user.py
index f14141af..d25951a2 100644
--- a/csm_web/scheduler/tests/models/test_user.py
+++ b/csm_web/scheduler/tests/models/test_user.py
@@ -1,5 +1,6 @@
 import pytest
 
+from django.db.utils import IntegrityError
 from scheduler.models import User
 
 
@@ -13,3 +14,22 @@ def test_create_user():
     assert user.username == username
     assert User.objects.count() == 1
     assert User.objects.get(email=email).username == username
+
+
+@pytest.mark.django_db
+def test_same_email():
+    email = "test@berkeley.edu"
+    username = "test"
+    caps_email = "TEST@BERKELEY.EDU"
+    caps_username = "TEST"
+    user, created = User.objects.get_or_create(email=email, username=username)
+    with pytest.raises(IntegrityError):
+        caps_user, caps_created = User.objects.get_or_create(email=caps_email, username=caps_username)
+
+    assert created
+    assert user.email == email
+    assert user.email != caps_email
+    assert user.username == username
+    assert user.username != caps_username
+    assert User.objects.count() == 1
+    assert User.objects.get(email=email).username == username