diff --git a/docs/source/reference_index/apps/users.rst b/docs/source/reference_index/apps/users.rst
index 9b3a3dc14b9..c55d74fd854 100644
--- a/docs/source/reference_index/apps/users.rst
+++ b/docs/source/reference_index/apps/users.rst
@@ -11,6 +11,7 @@ users
    api
    courses_urls
    forms
+   management.commands.archive_users
    management.commands.import_groups
    management.commands.lock
    models
diff --git a/intranet/apps/dataimport/management/commands/year_cleanup.py b/intranet/apps/dataimport/management/commands/year_cleanup.py
index 31150acc519..7bc37458d64 100644
--- a/intranet/apps/dataimport/management/commands/year_cleanup.py
+++ b/intranet/apps/dataimport/management/commands/year_cleanup.py
@@ -22,6 +22,10 @@ def add_arguments(self, parser):
             default=get_senior_graduation_year(),
             help="The senior graduation year",
         )
+        user_mode = parser.add_mutually_exclusive_group(required=True)
+        user_mode.add_argument("--delete-users", action="store_true", dest="delete_users", help="Delete graduated users.")
+        user_mode.add_argument("--archive-users", action="store_true", dest="archive_users", help="Archive graduated users instead of deleting.")
+        user_mode.add_argument("--no-user-changes", action="store_true", dest="no_user_changes", help="Do not change users.")
 
     def ask(self, q):
         if input(f"{q} [Yy]: ").lower() != "y":
@@ -81,9 +85,16 @@ def handle(self, *args, **options):
         if do_run:
             self.update_welcome()
 
-        self.stdout.write("Deleting graduated users")
-        if do_run:
-            self.handle_delete(senior_grad_year=senior_grad_year)
+        if options["delete_users"]:
+            self.stdout.write("Deleting graduated users")
+            if do_run:
+                self.handle_delete(senior_grad_year=senior_grad_year)
+        elif options["archive_users"]:
+            self.stdout.write("Archiving graduated users")
+            if do_run:
+                self.handle_archive(senior_grad_year=senior_grad_year)
+        else:
+            self.stdout.write("Skipping user delete/archive")
 
         self.stdout.write("Archiving admin comments")
         if do_run:
@@ -112,3 +123,10 @@ def handle_delete(self, *, senior_grad_year: int):
                 usr.user_type = "alum"
                 usr.save()
                 self.stdout.write(f"User {usr.username} KEEP")
+
+    def handle_archive(self, *, senior_grad_year: int):
+        users = get_user_model().objects.filter(graduation_year__lt=senior_grad_year).exclude(user_type="alum")
+        archived_count, already_archived_count = get_user_model().archive_users(users)
+        self.stdout.write(f"Archived users: {archived_count}")
+        if already_archived_count:
+            self.stdout.write(f"Already archived users: {already_archived_count}")
diff --git a/intranet/apps/dataimport/tests.py b/intranet/apps/dataimport/tests.py
index b4f641d14a5..73d4fee5847 100755
--- a/intranet/apps/dataimport/tests.py
+++ b/intranet/apps/dataimport/tests.py
@@ -19,7 +19,7 @@ def test_year_cleanup(self):
         out = StringIO()
         year = timezone.now().year
         turnover_date = datetime(year, 7, 1)
-        call_command("year_cleanup", stdout=out, senior_grad_year=year + 1)
+        call_command("year_cleanup", stdout=out, senior_grad_year=year + 1, delete_users=True)
         output = [
             "In pretend mode.",
             "Turnover date set to: {}".format(turnover_date.strftime("%c")),
@@ -52,7 +52,7 @@ def test_actual_year_cleanup(self):
             "intranet.apps.dataimport.management.commands.year_cleanup.timezone.now",
             return_value=datetime(2020, 6, 20, tzinfo=pytz.timezone("America/New_York")),
         ) as m:
-            call_command("year_cleanup", senior_grad_year=2021, run=True, confirm=True)
+            call_command("year_cleanup", senior_grad_year=2021, run=True, confirm=True, delete_users=True)
 
         m.assert_called()
 
diff --git a/intranet/apps/users/admin.py b/intranet/apps/users/admin.py
index c4d39bbd1e9..ea23fb62edc 100644
--- a/intranet/apps/users/admin.py
+++ b/intranet/apps/users/admin.py
@@ -1,10 +1,19 @@
-from django.contrib import admin
+from django.contrib import admin, messages
 
 from ..users.models import Course, Section, User, UserProperties
 
 
 @admin.register(User)
 class UserAdmin(admin.ModelAdmin):
+    @admin.action(description="Archive selected users")
+    def archive_users(self, request, queryset):
+        archived_count, already_archived_count = User.archive_users(queryset)
+
+        if archived_count:
+            self.message_user(request, f"Archived {archived_count} users.")
+        if already_archived_count:
+            self.message_user(request, f"{already_archived_count} users already archived.", level=messages.WARNING)
+
     # Render is_active using checkmarks or crosses
     def user_active(self, obj):
         return obj.is_active
@@ -42,6 +51,7 @@ def user_active(self, obj):
         "nickname",
         "student_id",
     )
+    actions = ("archive_users",)
 
 
 admin.site.register(UserProperties)
diff --git a/intranet/apps/users/management/commands/archive_users.py b/intranet/apps/users/management/commands/archive_users.py
new file mode 100644
index 00000000000..4f291806b4a
--- /dev/null
+++ b/intranet/apps/users/management/commands/archive_users.py
@@ -0,0 +1,107 @@
+import csv
+
+from django.contrib.auth import get_user_model
+from django.core.management.base import BaseCommand, CommandError
+
+
+class Command(BaseCommand):
+    help = "Archive users (lock accounts) from a CSV file."
+
+    def add_arguments(self, parser):
+        parser.add_argument(
+            "--filename",
+            dest="filename",
+            type=str,
+            required=True,
+            help="Filename to import data from.",
+        )
+        parser.add_argument(
+            "--column-header",
+            dest="header",
+            default="username",
+            type=str,
+            help="Header associated with the identifier column in the CSV.",
+        )
+        parser.add_argument(
+            "--lookup-field",
+            dest="lookup_field",
+            default="username",
+            type=str,
+            help="User model field used to match identifiers (ex: username, student_id, email).",
+        )
+        parser.add_argument(
+            "--run",
+            action="store_true",
+            dest="run",
+            help="Actually run.",
+        )
+        parser.add_argument(
+            "--confirm",
+            action="store_true",
+            dest="confirm",
+            help="Skip confirmation prompt (only applies with --run).",
+        )
+
+    def ask(self, q) -> bool:
+        return input(f"{q} [y/N]: ").strip().lower() == "y"
+
+    def read_identifiers(self, filename: str, column_header: str):
+        identifiers = []
+        try:
+            with open(filename, encoding="utf-8") as csvfile:
+                reader = csv.DictReader(csvfile)
+                for row in reader:
+                    value = row.get(column_header)
+                    if value:
+                        identifiers.append(value.strip())
+        except FileNotFoundError as e:
+            raise CommandError(f"File not found: {filename}") from e
+        except OSError as e:
+            raise CommandError(f"Error reading file: {e}") from e
+        return identifiers
+
+    def handle(self, *args, **options):
+        identifiers = self.read_identifiers(options["filename"], options["header"])
+        if not identifiers:
+            self.stdout.write(self.style.WARNING("No identifiers found in the CSV."))
+            return
+
+        total_identifiers = len(identifiers)
+        unique_identifiers = list(dict.fromkeys(identifiers))
+        duplicate_count = total_identifiers - len(unique_identifiers)
+
+        user_model = get_user_model()
+        lookup_field = options["lookup_field"]
+        valid_fields = {field.name for field in user_model._meta.get_fields()}
+        if lookup_field not in valid_fields:
+            raise CommandError(f"Invalid lookup field: {lookup_field}")
+        lookup_key = f"{lookup_field}__in"
+
+        users = user_model.objects.filter(**{lookup_key: unique_identifiers})
+        found_values = set(users.values_list(lookup_field, flat=True))
+        missing = sorted(value for value in unique_identifiers if value not in found_values)
+
+        self.stdout.write(f"Identifiers provided: {total_identifiers}")
+        self.stdout.write(f"Unique identifiers: {len(unique_identifiers)}")
+        if duplicate_count:
+            self.stdout.write(self.style.WARNING(f"Duplicate identifiers: {duplicate_count}"))
+        self.stdout.write(f"Matched users: {users.count()}")
+        self.stdout.write(f"Missing identifiers: {len(missing)}")
+        if missing:
+            self.stdout.write(self.style.WARNING(str(missing)))
+
+        if not options["run"]:
+            self.stdout.write("Dry run mode.")
+            return
+
+        if not options["confirm"]:
+            if not self.ask(
+                "This script will archive users (lock accounts). Ensure\nthat you know what you're doing before proceeding.\n\nContinue?"
+            ):
+                self.stdout.write("Aborted.")
+                return
+
+        archived_count, already_archived_count = user_model.archive_users(users)
+        self.stdout.write(self.style.SUCCESS(f"Archived users: {archived_count}"))
+        if already_archived_count:
+            self.stdout.write(self.style.WARNING(f"Already archived users: {already_archived_count}"))
diff --git a/intranet/apps/users/models.py b/intranet/apps/users/models.py
index a4a5212abf7..c0f2306bd27 100644
--- a/intranet/apps/users/models.py
+++ b/intranet/apps/users/models.py
@@ -842,6 +842,26 @@ def is_active(self) -> bool:
 
         return not self.username.startswith("INVALID_USER") and not self.user_locked
 
+    @classmethod
+    def archive_users(cls, queryset, *, update_admin_comments: bool = False) -> tuple[int, int]:
+        to_archive = queryset.filter(user_locked=False)
+        already_archived_count = queryset.filter(user_locked=True).count()
+
+        if update_admin_comments:
+            current_year = timezone.localdate().year
+            previous_year = current_year - 1
+            archived_count = 0
+            for user in to_archive:
+                user.user_locked = True
+                if user.admin_comments:
+                    user.admin_comments = f"\n=== {previous_year}-{current_year} comments ===\n{user.admin_comments}"
+                user.save(update_fields=["user_locked", "admin_comments"])
+                archived_count += 1
+        else:
+            archived_count = to_archive.update(user_locked=True)
+
+        return archived_count, already_archived_count
+
     @property
     def is_restricted(self) -> bool:
         """Checks if user needs the restricted view of Ion