diff --git a/src/registrar/admin.py b/src/registrar/admin.py
index 215239d66..c0f52c696 100644
--- a/src/registrar/admin.py
+++ b/src/registrar/admin.py
@@ -2655,6 +2655,27 @@ class WaffleFlagAdmin(FlagAdmin):
         model = models.WaffleFlag
         fields = "__all__"
 
+class DomainGroupResource(resources.ModelResource):
+    """defines how each field in the referenced model should be mapped to the corresponding fields in the
+    import/export file"""
+
+    class Meta:
+        model = models.DomainGroup
+
+class DomainGroupAdmin(ListHeaderAdmin, ImportExportModelAdmin):
+    resource_classes = [DomainGroupResource]
+    list_display = ["name", "portfolio"]
+
+class SuborganizationResource(resources.ModelResource):
+    """defines how each field in the referenced model should be mapped to the corresponding fields in the
+    import/export file"""
+
+    class Meta:
+        model = models.Suborganization
+
+class SuborganizationAdmin(ListHeaderAdmin, ImportExportModelAdmin):
+    resource_classes = [SuborganizationResource]
+    list_display = ["name", "portfolio"]
 
 admin.site.unregister(LogEntry)  # Unregister the default registration
 
@@ -2679,6 +2700,8 @@ admin.site.register(models.DomainRequest, DomainRequestAdmin)
 admin.site.register(models.TransitionDomain, TransitionDomainAdmin)
 admin.site.register(models.VerifiedByStaff, VerifiedByStaffAdmin)
 admin.site.register(models.Portfolio, PortfolioAdmin)
+admin.site.register(models.DomainGroup, DomainGroupAdmin)
+admin.site.register(models.Suborganization, SuborganizationAdmin)
 
 # Register our custom waffle implementations
 admin.site.register(models.WaffleFlag, WaffleFlagAdmin)
diff --git a/src/registrar/migrations/0105_suborganization_domaingroup.py b/src/registrar/migrations/0105_suborganization_domaingroup.py
new file mode 100644
index 000000000..3d99a4001
--- /dev/null
+++ b/src/registrar/migrations/0105_suborganization_domaingroup.py
@@ -0,0 +1,41 @@
+# Generated by Django 4.2.10 on 2024-06-20 21:18
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("registrar", "0104_create_groups_v13"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="Suborganization",
+            fields=[
+                ("id", models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name="ID")),
+                ("created_at", models.DateTimeField(auto_now_add=True)),
+                ("updated_at", models.DateTimeField(auto_now=True)),
+                ("name", models.CharField(blank=True, help_text="Domain group", null=True, unique=True)),
+                ("portfolio", models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, to="registrar.portfolio")),
+            ],
+            options={
+                "abstract": False,
+            },
+        ),
+        migrations.CreateModel(
+            name="DomainGroup",
+            fields=[
+                ("id", models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name="ID")),
+                ("created_at", models.DateTimeField(auto_now_add=True)),
+                ("updated_at", models.DateTimeField(auto_now=True)),
+                ("name", models.CharField(blank=True, help_text="Domain group", null=True, unique=True)),
+                ("domains", models.ManyToManyField(blank=True, to="registrar.domaininformation")),
+                ("portfolio", models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, to="registrar.portfolio")),
+            ],
+            options={
+                "unique_together": {("name", "portfolio")},
+            },
+        ),
+    ]
diff --git a/src/registrar/models/__init__.py b/src/registrar/models/__init__.py
index b2cffaf32..2af89ce00 100644
--- a/src/registrar/models/__init__.py
+++ b/src/registrar/models/__init__.py
@@ -17,6 +17,8 @@ from .transition_domain import TransitionDomain
 from .verified_by_staff import VerifiedByStaff
 from .waffle_flag import WaffleFlag
 from .portfolio import Portfolio
+from .domain_group import DomainGroup
+from .suborganization import Suborganization
 
 
 __all__ = [
@@ -38,6 +40,8 @@ __all__ = [
     "VerifiedByStaff",
     "WaffleFlag",
     "Portfolio",
+    "DomainGroup",
+    "Suborganization"
 ]
 
 auditlog.register(Contact)
@@ -58,3 +62,5 @@ auditlog.register(TransitionDomain)
 auditlog.register(VerifiedByStaff)
 auditlog.register(WaffleFlag)
 auditlog.register(Portfolio)
+auditlog.register(DomainGroup)
+auditlog.register(Suborganization)
diff --git a/src/registrar/models/domain_group.py b/src/registrar/models/domain_group.py
new file mode 100644
index 000000000..aa6d64e1f
--- /dev/null
+++ b/src/registrar/models/domain_group.py
@@ -0,0 +1,33 @@
+from django.db import models
+from .utility.time_stamped_model import TimeStampedModel
+from registrar.models.portfolio import Portfolio
+from registrar.models.domain_information import DomainInformation
+
+
+class DomainGroup(TimeStampedModel):
+
+    class Meta:
+        unique_together = [("name", "portfolio")]
+
+    """
+    TODO: Write DomainGroup description
+    """
+    name = models.CharField(
+        null=True,
+        blank=True,
+        unique=True,
+        help_text="Domain group",
+    )
+
+    portfolio = models.ForeignKey(
+        "registrar.Portfolio",
+        on_delete=models.PROTECT
+    )
+
+    domains = models.ManyToManyField(
+        "registrar.DomainInformation",
+        blank=True
+    )
+
+    def __str__(self) -> str:
+        return f"{self.name}"
\ No newline at end of file
diff --git a/src/registrar/models/portfolio.py b/src/registrar/models/portfolio.py
index a05422960..0ea036bb7 100644
--- a/src/registrar/models/portfolio.py
+++ b/src/registrar/models/portfolio.py
@@ -97,3 +97,6 @@ class Portfolio(TimeStampedModel):
         verbose_name="security contact e-mail",
         max_length=320,
     )
+
+    def __str__(self) -> str:
+        return f"{self.organization_name}"
diff --git a/src/registrar/models/suborganization.py b/src/registrar/models/suborganization.py
new file mode 100644
index 000000000..6ebae62e2
--- /dev/null
+++ b/src/registrar/models/suborganization.py
@@ -0,0 +1,23 @@
+from django.db import models
+from .utility.time_stamped_model import TimeStampedModel
+from registrar.models.portfolio import Portfolio
+
+
+class Suborganization(TimeStampedModel):
+    """
+    TODO: Write DomainGroup description
+    """
+    name = models.CharField(
+        null=True,
+        blank=True,
+        unique=True,
+        help_text="Domain group",
+    )
+
+    portfolio = models.ForeignKey(
+        "registrar.Portfolio",
+        on_delete=models.PROTECT,
+    )
+
+    def __str__(self) -> str:
+        return f"{self.name}"