diff --git a/lms/djangoapps/courseware/access.py b/lms/djangoapps/courseware/access.py
index 46668f1aa8..b03144888f 100644
--- a/lms/djangoapps/courseware/access.py
+++ b/lms/djangoapps/courseware/access.py
@@ -27,7 +27,6 @@ from lms.djangoapps.courseware.access_response import (
     MilestoneAccessError,
     MobileAvailabilityError,
     NoAllowedPartitionGroupsError,
-    OldMongoAccessError,
     VisibilityError
 )
 from lms.djangoapps.courseware.access_utils import (
@@ -330,9 +329,6 @@ def _has_access_course(user, action, courselike):
         # ).or(
         #     _has_staff_access_to_descriptor, user, courselike, courselike.id
         # )
-        if courselike.id.deprecated:  # we no longer support accessing Old Mongo courses
-            return OldMongoAccessError(courselike)
-
         visible_to_nonstaff = _visible_to_nonstaff_users(courselike)
         if not visible_to_nonstaff:
             staff_access = _has_staff_access_to_descriptor(user, courselike, courselike.id)
diff --git a/lms/djangoapps/courseware/access_response.py b/lms/djangoapps/courseware/access_response.py
index 674003d6c8..e88b58d205 100644
--- a/lms/djangoapps/courseware/access_response.py
+++ b/lms/djangoapps/courseware/access_response.py
@@ -236,16 +236,3 @@ class AuthenticationRequiredAccessError(AccessError):
         developer_message = "User must be authenticated to view the course"
         user_message = _("You must be logged in to see this course")
         super().__init__(error_code, developer_message, user_message)
-
-
-class OldMongoAccessError(AccessError):
-    """
-    Access denied because the course is in Old Mongo and we no longer support them. See DEPR-58.
-    """
-    def __init__(self, courselike):
-        error_code = 'old_mongo'
-        developer_message = 'Access to Old Mongo courses is unsupported'
-        user_message = _('{course_name} is no longer available.').format(
-            course_name=courselike.display_name_with_default,
-        )
-        super().__init__(error_code, developer_message, user_message)
diff --git a/lms/djangoapps/courseware/courses.py b/lms/djangoapps/courseware/courses.py
index cd755a8d47..89fa7c0596 100644
--- a/lms/djangoapps/courseware/courses.py
+++ b/lms/djangoapps/courseware/courses.py
@@ -27,7 +27,6 @@ from lms.djangoapps.courseware.access_response import (
     AuthenticationRequiredAccessError,
     EnrollmentRequiredAccessError,
     MilestoneAccessError,
-    OldMongoAccessError,
     StartDateError,
 )
 from lms.djangoapps.courseware.date_summary import (
@@ -214,15 +213,6 @@ def check_course_access_with_redirect(course, user, action, check_if_enrolled=Fa
                 params=params.urlencode()
             ), access_response)
 
-        # Redirect if trying to access an Old Mongo course
-        if isinstance(access_response, OldMongoAccessError):
-            params = QueryDict(mutable=True)
-            params['access_response_error'] = access_response.user_message
-            raise CourseAccessRedirect('{dashboard_url}?{params}'.format(
-                dashboard_url=reverse('dashboard'),
-                params=params.urlencode(),
-            ), access_response)
-
         # Redirect if the user must answer a survey before entering the course.
         if isinstance(access_response, MilestoneAccessError):
             raise CourseAccessRedirect('{dashboard_url}'.format(
diff --git a/lms/djangoapps/courseware/tests/test_courses.py b/lms/djangoapps/courseware/tests/test_courses.py
index 7dd231b1eb..df85d58ff6 100644
--- a/lms/djangoapps/courseware/tests/test_courses.py
+++ b/lms/djangoapps/courseware/tests/test_courses.py
@@ -39,7 +39,6 @@ from lms.djangoapps.courseware.courses import (
     get_courses,
     get_current_child
 )
-from lms.djangoapps.courseware.exceptions import CourseAccessRedirect
 from lms.djangoapps.courseware.model_data import FieldDataCache
 from lms.djangoapps.courseware.module_render import get_module_for_descriptor
 from lms.djangoapps.courseware.courseware_access_exception import CoursewareAccessException
@@ -89,18 +88,6 @@ class CoursesTest(ModuleStoreTestCase):
         assert error.value.access_response.error_code == 'not_visible_to_user'
         assert not error.value.access_response.has_access
 
-    @ddt.data(GET_COURSE_WITH_ACCESS, GET_COURSE_OVERVIEW_WITH_ACCESS)
-    def test_old_mongo_access_error(self, course_access_func_name):
-        course_access_func = self.COURSE_ACCESS_FUNCS[course_access_func_name]
-        user = UserFactory.create()
-        with self.store.default_store(ModuleStoreEnum.Type.mongo):
-            course = CourseFactory.create()
-
-        with pytest.raises(CourseAccessRedirect) as error:
-            course_access_func(user, 'load', course.id)
-        assert error.value.access_error.error_code == 'old_mongo'
-        assert not error.value.access_error.has_access
-
     @ddt.data(
         (GET_COURSE_WITH_ACCESS, 2),
         (GET_COURSE_OVERVIEW_WITH_ACCESS, 0),
diff --git a/openedx/features/course_experience/tests/views/test_course_home.py b/openedx/features/course_experience/tests/views/test_course_home.py
index ab2abc5fef..9b107528da 100644
--- a/openedx/features/course_experience/tests/views/test_course_home.py
+++ b/openedx/features/course_experience/tests/views/test_course_home.py
@@ -527,25 +527,6 @@ class TestCourseHomePageAccess(CourseHomePageTestCase):
         )
         self.assertRedirects(response, expected_url)
 
-    def test_old_mongo_access_error(self):
-        """
-        Ensure that a user accessing an Old Mongo course sees a redirect to
-        the student dashboard, not a 404.
-        """
-        course = CourseFactory.create(default_store=ModuleStoreEnum.Type.mongo)
-        user = UserFactory(password=self.TEST_PASSWORD)
-        self.client.login(username=user.username, password=self.TEST_PASSWORD)
-
-        response = self.client.get(course_home_url(course))
-
-        expected_params = QueryDict(mutable=True)
-        expected_params['access_response_error'] = f'{course.display_name_with_default} is no longer available.'
-        expected_url = '{url}?{params}'.format(
-            url=reverse('dashboard'),
-            params=expected_params.urlencode(),
-        )
-        self.assertRedirects(response, expected_url)
-
     @mock.patch.dict(settings.FEATURES, {'DISABLE_START_DATES': False})
     def test_expiration_banner_with_expired_upgrade_deadline(self):
         """