diff --git a/backend/samfundet/admin.py b/backend/samfundet/admin.py
index 8189cfb7c..a44e1863b 100644
--- a/backend/samfundet/admin.py
+++ b/backend/samfundet/admin.py
@@ -66,6 +66,7 @@
     RecruitmentInterviewAvailability,
     RecruitmentPositionSharedInterviewGroup,
 )
+from .models.site_banner import SiteBanner
 
 # Common fields:
 # ordering = []
@@ -90,6 +91,14 @@ class OccupiedTimeAdmin(admin.ModelAdmin):
     list_select_related = True
 
 
+@admin.register(SiteBanner)
+class SiteBannerAdmin(CustomBaseAdmin):
+    list_display = ['id', 'start_at', 'end_at', 'updated_at']
+    search_fields = ['text_nb', 'text_en']
+    ordering = ['-start_at', '-created_at']
+    list_select_related = True
+
+
 @admin.register(User)
 class UserAdmin(CustomGuardedUserAdmin):
     sortable_by = [
diff --git a/backend/samfundet/migrations/0006_sitebanner.py b/backend/samfundet/migrations/0006_sitebanner.py
new file mode 100644
index 000000000..ac4d56083
--- /dev/null
+++ b/backend/samfundet/migrations/0006_sitebanner.py
@@ -0,0 +1,36 @@
+# Generated by Django 5.2.11 on 2026-04-23 13:57
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('samfundet', '0005_medlemsinfo'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='SiteBanner',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('version', models.PositiveIntegerField(blank=True, default=0, editable=False, null=True)),
+                ('created_at', models.DateTimeField(blank=True, editable=False, null=True)),
+                ('updated_at', models.DateTimeField(blank=True, editable=False, null=True)),
+                ('text_nb', models.CharField(max_length=128)),
+                ('text_en', models.CharField(max_length=128)),
+                ('url', models.CharField(blank=True, max_length=500, null=True)),
+                ('new_tab', models.BooleanField(default=False)),
+                ('start_at', models.DateTimeField()),
+                ('end_at', models.DateTimeField(blank=True, null=True)),
+                ('created_by', models.ForeignKey(blank=True, editable=False, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='+', to=settings.AUTH_USER_MODEL)),
+                ('updated_by', models.ForeignKey(blank=True, editable=False, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='+', to=settings.AUTH_USER_MODEL)),
+            ],
+            options={
+                'verbose_name': 'Site banner',
+                'verbose_name_plural': 'Site banners',
+            },
+        ),
+    ]
diff --git a/backend/samfundet/models/__init__.py b/backend/samfundet/models/__init__.py
index 8e427388b..a8f1908ce 100644
--- a/backend/samfundet/models/__init__.py
+++ b/backend/samfundet/models/__init__.py
@@ -16,6 +16,7 @@
     Organization,
     UserPreference,
 )
+from .site_banner import SiteBanner
 
 __all__ = [
     'User',
@@ -26,4 +27,5 @@
     'Image',
     'Profile',
     'UserPreference',
+    'SiteBanner',
 ]
diff --git a/backend/samfundet/models/site_banner.py b/backend/samfundet/models/site_banner.py
new file mode 100644
index 000000000..a9fec6160
--- /dev/null
+++ b/backend/samfundet/models/site_banner.py
@@ -0,0 +1,33 @@
+from __future__ import annotations
+
+from django.db import models
+from django.utils import timezone
+
+from root.utils.mixins import CustomBaseModel
+
+
+class SiteBanner(CustomBaseModel):
+    text_nb = models.CharField(max_length=128)
+    text_en = models.CharField(max_length=128)
+
+    url = models.CharField(max_length=500, blank=True, null=True)
+    new_tab = models.BooleanField(default=False)
+
+    start_at = models.DateTimeField()
+    end_at = models.DateTimeField(null=True, blank=True)
+
+    class Meta:
+        verbose_name = 'Site banner'
+        verbose_name_plural = 'Site banners'
+
+    def __str__(self) -> str:
+        return f'{self.text_nb[:40]}'
+
+    @classmethod
+    def active(cls) -> models.QuerySet:
+        now = timezone.now()
+        return cls.objects.filter(
+            start_at__lte=now,
+        ).filter(
+            models.Q(end_at__isnull=True) | models.Q(end_at__gte=now),
+        )
diff --git a/backend/samfundet/serializers.py b/backend/samfundet/serializers.py
index 7ea8f8ffd..f224009ac 100644
--- a/backend/samfundet/serializers.py
+++ b/backend/samfundet/serializers.py
@@ -65,6 +65,7 @@
     RecruitmentInterviewAvailability,
     RecruitmentPositionSharedInterviewGroup,
 )
+from .models.site_banner import SiteBanner
 from .models.model_choices import RecruitmentStatusChoices, RecruitmentPriorityChoices
 
 if TYPE_CHECKING:
@@ -284,6 +285,21 @@ class Meta:
         fields = '__all__'
 
 
+class SiteBannerSerializer(CustomBaseSerializer):
+    class Meta:
+        model = SiteBanner
+        fields = [
+            'id',
+            'version',
+            'text_nb',
+            'text_en',
+            'url',
+            'new_tab',
+            'start_at',
+            'end_at',
+        ]
+
+
 class ChangePasswordSerializer(serializers.Serializer):
     current_password = serializers.CharField(required=True)
     new_password = serializers.CharField(required=True)
diff --git a/backend/samfundet/urls.py b/backend/samfundet/urls.py
index 5bd564529..ce5a4eb69 100644
--- a/backend/samfundet/urls.py
+++ b/backend/samfundet/urls.py
@@ -10,6 +10,7 @@
 import samfundet.view.mdb_views
 import samfundet.view.user_views
 import samfundet.view.event_views
+import samfundet.view.site_banners
 import samfundet.view.sulten_views
 import samfundet.view.general_views
 from samfundet.view import billig_views
@@ -45,6 +46,7 @@
 router.register('organizations', samfundet.view.general_views.OrganizationView, 'organizations')
 router.register('merch', samfundet.view.general_views.MerchView, 'merch')
 router.register('role', samfundet.view.general_views.RoleView, 'role')
+router.register('site-banners', samfundet.view.site_banners.SiteBannerView, 'site_banners')
 
 ########## Recruitment ##########
 router.register('recruitment', recruitment_views.RecruitmentView, 'recruitment')
diff --git a/backend/samfundet/view/site_banners.py b/backend/samfundet/view/site_banners.py
new file mode 100644
index 000000000..7b4a742eb
--- /dev/null
+++ b/backend/samfundet/view/site_banners.py
@@ -0,0 +1,28 @@
+from __future__ import annotations
+
+from rest_framework import decorators
+from rest_framework.request import Request
+from rest_framework.response import Response
+from rest_framework.viewsets import ReadOnlyModelViewSet
+from rest_framework.permissions import AllowAny
+
+from django.db import models
+
+from samfundet.serializers import SiteBannerSerializer
+from samfundet.models.site_banner import SiteBanner
+
+
+class SiteBannerView(ReadOnlyModelViewSet):
+    permission_classes = [AllowAny]
+    serializer_class = SiteBannerSerializer
+
+    def get_queryset(self) -> models.QuerySet:
+        return SiteBanner.active().order_by('-start_at', '-created_at')
+
+    @decorators.action(detail=False, methods=['get'], url_path='active')
+    def active(self, request: Request) -> Response:
+        banner = self.get_queryset().first()
+        if banner is None:
+            return Response(None)
+        serializer = self.get_serializer(banner)
+        return Response(serializer.data)
diff --git a/frontend/src/Components/NavbarSamfThree/Navbar.module.scss b/frontend/src/Components/NavbarSamfThree/Navbar.module.scss
index fbcd81d9c..803cbd823 100644
--- a/frontend/src/Components/NavbarSamfThree/Navbar.module.scss
+++ b/frontend/src/Components/NavbarSamfThree/Navbar.module.scss
@@ -44,7 +44,8 @@ $navbar-link-transparent-hover-gradient-bottom: transparent;
 /* Main navbar */
 #navbar_container {
   position: fixed;
-  top: 0;
+  top: var(--site-banner-offset, 0);
+  transition: top 260ms ease-out;
   width: 100%;
   height: $navbar-height;
   background: $navbar-bg-dark;
@@ -57,6 +58,10 @@ $navbar-link-transparent-hover-gradient-bottom: transparent;
   box-shadow: 0 0 25px 5px rgba(0, 0, 0, 0);
 }
 
+:global(.site-banner-covered) #navbar_container {
+  top: 0;
+}
+
 .navbar_inner {
   flex: 1;
   max-width: 1200px;
diff --git a/frontend/src/Components/SamfOutlet/SamfOutlet.tsx b/frontend/src/Components/SamfOutlet/SamfOutlet.tsx
index e7ee79a4c..555c47d44 100644
--- a/frontend/src/Components/SamfOutlet/SamfOutlet.tsx
+++ b/frontend/src/Components/SamfOutlet/SamfOutlet.tsx
@@ -1,6 +1,7 @@
 import type { ReactNode } from 'react';
-import { Outlet } from 'react-router';
+import { Outlet, useLocation } from 'react-router';
 import { Navbar } from '~/Components/NavbarSamfThree/Navbar';
+import { SiteBanner } from '~/Components/SiteBanner/SiteBanner';
 import { Footer } from '../Footer';
 import styles from './SamfOutlet.module.scss';
 
@@ -13,11 +14,16 @@ export function SamfOutlet() {
 }
 
 export function SamfLayout({ children }: { children: ReactNode }) {
+  const location = useLocation();
+
+  const showBanner = location.pathname === '/' || location.pathname === '/home/';
+
   return (
     <>
       {/* TODO: Uncomment the following line when samf4 navbar is enabled */}
       {/* <Navbar /> */}
       {/* TODO: Remove the following line when samf4 navbar is enabled */}
+      {showBanner && <SiteBanner />}
       <Navbar />
       <div className={styles.navbar_outlet}>{children}</div>
       <Footer />
diff --git a/frontend/src/Components/SiteBanner/SiteBanner.module.scss b/frontend/src/Components/SiteBanner/SiteBanner.module.scss
new file mode 100644
index 000000000..40d95ce45
--- /dev/null
+++ b/frontend/src/Components/SiteBanner/SiteBanner.module.scss
@@ -0,0 +1,59 @@
+@use 'src/constants' as *;
+
+.banner {
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  z-index: 11;
+  background: $red-samf;
+  color: $white;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  padding: 0.5rem 1rem;
+  overflow: hidden;
+}
+
+.content {
+  width: 100%;
+  max-width: 1200px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  gap: 0.75rem;
+  text-align: center;
+  overflow: hidden;
+}
+
+.text {
+  flex: 1;
+  min-width: 0;
+  text-align: center;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.link {
+  color: inherit;
+  text-decoration: underline;
+
+  &:focus-visible {
+    outline: 2px solid currentcolor;
+    outline-offset: 2px;
+  }
+}
+
+@media (max-width: 900px) {
+  .content {
+    flex-direction: column;
+    gap: 0.35rem;
+  }
+
+  .text {
+    white-space: normal;
+    overflow-wrap: anywhere;
+    word-break: break-word;
+  }
+}
diff --git a/frontend/src/Components/SiteBanner/SiteBanner.tsx b/frontend/src/Components/SiteBanner/SiteBanner.tsx
new file mode 100644
index 000000000..1bd6ee139
--- /dev/null
+++ b/frontend/src/Components/SiteBanner/SiteBanner.tsx
@@ -0,0 +1,82 @@
+import { useQuery } from '@tanstack/react-query';
+import { useLayoutEffect, useRef } from 'react';
+import { useTranslation } from 'react-i18next';
+import { getActiveSiteBanner } from '~/api';
+import { useScrollY } from '~/hooks';
+import { siteBannerKeys } from '~/queryKeys';
+import { dbT } from '~/utils';
+import styles from './SiteBanner.module.scss';
+
+type Props = {
+  hideAfterPx?: number;
+};
+
+export function SiteBanner({ hideAfterPx = 1000 }: Props): JSX.Element | null {
+  const ref = useRef<HTMLDivElement | null>(null);
+  const { i18n } = useTranslation();
+  const scrollY = useScrollY();
+  const isCoveredByNavbar = scrollY > hideAfterPx;
+
+  const { data: visibleBanner } = useQuery({
+    queryKey: siteBannerKeys.active(),
+    queryFn: getActiveSiteBanner,
+  });
+
+  useLayoutEffect(() => {
+    const root = document.documentElement;
+    const setOffset = (px: number) => root.style.setProperty('--site-banner-offset', `${px}px`);
+    const el = ref.current;
+
+    if (!visibleBanner || !el) {
+      setOffset(0);
+      return;
+    }
+
+    const updateOffset = () => {
+      setOffset(el.offsetHeight);
+    };
+
+    updateOffset();
+
+    const observer = new ResizeObserver(updateOffset);
+    observer.observe(el);
+    window.addEventListener('resize', updateOffset);
+
+    return () => {
+      observer.disconnect();
+      window.removeEventListener('resize', updateOffset);
+      setOffset(0);
+    };
+  }, [visibleBanner]);
+
+  useLayoutEffect(() => {
+    document.documentElement.classList.toggle('site-banner-covered', isCoveredByNavbar);
+
+    return () => {
+      document.documentElement.classList.remove('site-banner-covered');
+    };
+  }, [isCoveredByNavbar]);
+
+  if (!visibleBanner) return null;
+
+  const content = <span className={styles.text}>{dbT(visibleBanner, 'text', i18n.language)}</span>;
+
+  return (
+    <div ref={ref} className={styles.banner} role="status" aria-live="polite">
+      <div className={styles.content}>
+        {visibleBanner.url ? (
+          <a
+            className={styles.link}
+            href={visibleBanner.url}
+            target={visibleBanner.new_tab ? '_blank' : undefined}
+            rel={visibleBanner.new_tab ? 'noopener noreferrer' : undefined}
+          >
+            {content}
+          </a>
+        ) : (
+          content
+        )}
+      </div>
+    </div>
+  );
+}
diff --git a/frontend/src/api.ts b/frontend/src/api.ts
index 93fb5c1ea..c3878d8f7 100644
--- a/frontend/src/api.ts
+++ b/frontend/src/api.ts
@@ -47,6 +47,7 @@ import type {
   RoleDto,
   RoleUsersDto,
   SaksdokumentDto,
+  SiteBannerDto,
   TextItemDto,
   UserDto,
   UserPreferenceDto,
@@ -156,6 +157,12 @@ export async function getHomeData(): Promise<HomePageDto> {
   return response.data;
 }
 
+export async function getActiveSiteBanner(): Promise<SiteBannerDto | null> {
+  const url = BACKEND_DOMAIN + ROUTES.backend.samfundet__site_banners_active;
+  const response = await axios.get<SiteBannerDto | null>(url, { withCredentials: true });
+  return response.data;
+}
+
 export async function putUserPreference(id: string | number, data: Partial<UserPreferenceDto>): Promise<unknown> {
   const url =
     BACKEND_DOMAIN +
diff --git a/frontend/src/dto.ts b/frontend/src/dto.ts
index 4ecd509da..db0be5dff 100644
--- a/frontend/src/dto.ts
+++ b/frontend/src/dto.ts
@@ -708,6 +708,17 @@ export type SultenReservationDayDto = {
   tables: TableDto[];
 };
 
+export type SiteBannerDto = {
+  id: number;
+  version: number;
+  text_nb: string;
+  text_en: string;
+  url: string | null;
+  new_tab: boolean;
+  start_at: string;
+  end_at: string | null;
+};
+
 export type RegistrationDto = {
   username: string;
   email: string;
diff --git a/frontend/src/queryKeys.ts b/frontend/src/queryKeys.ts
index add88d9e5..279f4f8b2 100644
--- a/frontend/src/queryKeys.ts
+++ b/frontend/src/queryKeys.ts
@@ -90,3 +90,8 @@ export const imageKeys = {
   details: () => [...imageKeys.all, 'detail'] as const,
   detail: (id: number) => [...imageKeys.details(), id] as const,
 };
+
+export const siteBannerKeys = {
+  all: ['siteBanners'] as const,
+  active: () => [...siteBannerKeys.all, 'active'] as const,
+};
diff --git a/frontend/src/routes/backend.ts b/frontend/src/routes/backend.ts
index c994d2db4..081590be2 100644
--- a/frontend/src/routes/backend.ts
+++ b/frontend/src/routes/backend.ts
@@ -334,6 +334,7 @@ export const ROUTES_BACKEND = {
   samfundet__gang_application_stats: '/recruitment/:recruitmentId/gang/:gangId/stats/',
   samfundet__recruitment_positions_by_tags: '/recruitment/:id/positions-by-tags/',
   samfundet__recruitment_all_applications: '/recruitment/all-applications/',
+  samfundet__site_banners_active: '/api/site-banners/active/',
   static__path: '/static/:path',
   media__path: '/media/:path',
-} as const;
\ No newline at end of file
+} as const;