diff --git a/src/registrar/admin.py b/src/registrar/admin.py
index 04730371c..ef7888005 100644
--- a/src/registrar/admin.py
+++ b/src/registrar/admin.py
@@ -1043,6 +1043,19 @@ class ContactAdmin(ListHeaderAdmin, ImportExportModelAdmin):
         return super().changelist_view(request, extra_context=extra_context)
 
 
+class SeniorOfficialAdmin(ListHeaderAdmin):
+    """Custom Senior Official Admin class."""
+
+    # NOTE: these are just placeholders.  Not part of ACs (haven't been defined yet).  Update in future tickets.
+    search_fields = ["first_name", "last_name", "email"]
+    search_help_text = "Search by first name, last name or email."
+    list_display = ["first_name", "last_name", "email"]
+
+    # this ordering effects the ordering of results
+    # in autocomplete_fields for Senior Official
+    ordering = ["first_name", "last_name"]
+
+
 class WebsiteResource(resources.ModelResource):
     """defines how each field in the referenced model should be mapped to the corresponding fields in the
     import/export file"""
@@ -2799,6 +2812,7 @@ admin.site.register(models.VerifiedByStaff, VerifiedByStaffAdmin)
 admin.site.register(models.Portfolio, PortfolioAdmin)
 admin.site.register(models.DomainGroup, DomainGroupAdmin)
 admin.site.register(models.Suborganization, SuborganizationAdmin)
+admin.site.register(models.SeniorOfficial, SeniorOfficialAdmin)
 
 # Register our custom waffle implementations
 admin.site.register(models.WaffleFlag, WaffleFlagAdmin)
diff --git a/src/registrar/migrations/0110_seniorofficial_portfolio_senior_official.py b/src/registrar/migrations/0110_seniorofficial_portfolio_senior_official.py
new file mode 100644
index 000000000..c344898c3
--- /dev/null
+++ b/src/registrar/migrations/0110_seniorofficial_portfolio_senior_official.py
@@ -0,0 +1,45 @@
+# Generated by Django 4.2.10 on 2024-07-02 21:03
+
+from django.db import migrations, models
+import django.db.models.deletion
+import phonenumber_field.modelfields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("registrar", "0109_domaininformation_sub_organization_and_more"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="SeniorOfficial",
+            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)),
+                ("first_name", models.CharField(verbose_name="first name")),
+                ("last_name", models.CharField(verbose_name="last name")),
+                ("title", models.CharField(verbose_name="title / role")),
+                (
+                    "phone",
+                    phonenumber_field.modelfields.PhoneNumberField(blank=True, max_length=128, null=True, region=None),
+                ),
+                ("email", models.EmailField(blank=True, max_length=320, null=True)),
+            ],
+            options={
+                "abstract": False,
+            },
+        ),
+        migrations.AddField(
+            model_name="portfolio",
+            name="senior_official",
+            field=models.ForeignKey(
+                blank=True,
+                help_text="Associated senior official",
+                null=True,
+                on_delete=django.db.models.deletion.PROTECT,
+                to="registrar.seniorofficial",
+            ),
+        ),
+    ]
diff --git a/src/registrar/migrations/0111_create_groups_v15.py b/src/registrar/migrations/0111_create_groups_v15.py
new file mode 100644
index 000000000..6b21f4b0d
--- /dev/null
+++ b/src/registrar/migrations/0111_create_groups_v15.py
@@ -0,0 +1,37 @@
+# This migration creates the create_full_access_group and create_cisa_analyst_group groups
+# It is dependent on 0079 (which populates federal agencies)
+# If permissions on the groups need changing, edit CISA_ANALYST_GROUP_PERMISSIONS
+# in the user_group model then:
+# [NOT RECOMMENDED]
+# step 1: docker-compose exec app ./manage.py migrate --fake registrar 0035_contenttypes_permissions
+# step 2: docker-compose exec app ./manage.py migrate registrar 0036_create_groups
+# step 3: fake run the latest migration in the migrations list
+# [RECOMMENDED]
+# Alternatively:
+# step 1: duplicate the migration that loads data
+# step 2: docker-compose exec app ./manage.py migrate
+
+from django.db import migrations
+from registrar.models import UserGroup
+from typing import Any
+
+
+# For linting: RunPython expects a function reference,
+# so let's give it one
+def create_groups(apps, schema_editor) -> Any:
+    UserGroup.create_cisa_analyst_group(apps, schema_editor)
+    UserGroup.create_full_access_group(apps, schema_editor)
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("registrar", "0110_seniorofficial_portfolio_senior_official"),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            create_groups,
+            reverse_code=migrations.RunPython.noop,
+            atomic=True,
+        ),
+    ]
diff --git a/src/registrar/models/__init__.py b/src/registrar/models/__init__.py
index 376739826..a68633aff 100644
--- a/src/registrar/models/__init__.py
+++ b/src/registrar/models/__init__.py
@@ -19,6 +19,7 @@ from .waffle_flag import WaffleFlag
 from .portfolio import Portfolio
 from .domain_group import DomainGroup
 from .suborganization import Suborganization
+from .senior_official import SeniorOfficial
 
 
 __all__ = [
@@ -42,6 +43,7 @@ __all__ = [
     "Portfolio",
     "DomainGroup",
     "Suborganization",
+    "SeniorOfficial",
 ]
 
 auditlog.register(Contact)
@@ -64,3 +66,4 @@ auditlog.register(WaffleFlag)
 auditlog.register(Portfolio)
 auditlog.register(DomainGroup)
 auditlog.register(Suborganization)
+auditlog.register(SeniorOfficial)
diff --git a/src/registrar/models/portfolio.py b/src/registrar/models/portfolio.py
index 0ea036bb7..c72f95c33 100644
--- a/src/registrar/models/portfolio.py
+++ b/src/registrar/models/portfolio.py
@@ -38,6 +38,15 @@ class Portfolio(TimeStampedModel):
         default=FederalAgency.get_non_federal_agency,
     )
 
+    senior_official = models.ForeignKey(
+        "registrar.SeniorOfficial",
+        on_delete=models.PROTECT,
+        help_text="Associated senior official",
+        unique=False,
+        null=True,
+        blank=True,
+    )
+
     organization_type = models.CharField(
         max_length=255,
         choices=OrganizationChoices.choices,
diff --git a/src/registrar/models/senior_official.py b/src/registrar/models/senior_official.py
new file mode 100644
index 000000000..3cb064790
--- /dev/null
+++ b/src/registrar/models/senior_official.py
@@ -0,0 +1,50 @@
+from django.db import models
+
+from .utility.time_stamped_model import TimeStampedModel
+from phonenumber_field.modelfields import PhoneNumberField  # type: ignore
+
+
+class SeniorOfficial(TimeStampedModel):
+    """
+    Senior Official is a distinct Contact-like entity (NOT to be inherited
+    from Contacts) developed for the unique role these individuals have in
+    managing Portfolios.
+    """
+
+    first_name = models.CharField(
+        null=False,
+        blank=False,
+        verbose_name="first name",
+    )
+    last_name = models.CharField(
+        null=False,
+        blank=False,
+        verbose_name="last name",
+    )
+    title = models.CharField(
+        null=False,
+        blank=False,
+        verbose_name="title / role",
+    )
+    phone = PhoneNumberField(
+        null=True,
+        blank=True,
+    )
+    email = models.EmailField(
+        null=True,
+        blank=True,
+        max_length=320,
+    )
+
+    def get_formatted_name(self):
+        """Returns the contact's name in Western order."""
+        names = [n for n in [self.first_name, self.last_name] if n]
+        return " ".join(names) if names else "Unknown"
+
+    def __str__(self):
+        if self.first_name or self.last_name:
+            return self.get_formatted_name()
+        elif self.pk:
+            return str(self.pk)
+        else:
+            return ""