diff --git a/src/servala/core/models/__init__.py b/src/servala/core/models/__init__.py
new file mode 100644
index 0000000..3456eab
--- /dev/null
+++ b/src/servala/core/models/__init__.py
@@ -0,0 +1,15 @@
+from .organization import (
+    BillingEntity,
+    Organization,
+    OrganizationMembership,
+    OrganizationOrigin,
+    OrganizationRole,
+)
+
+__all__ = [
+    "BillingEntity",
+    "Organization",
+    "OrganizationMembership",
+    "OrganizationOrigin",
+    "OrganizationRole",
+]
diff --git a/src/servala/core/models/organization.py b/src/servala/core/models/organization.py
new file mode 100644
index 0000000..371f0ee
--- /dev/null
+++ b/src/servala/core/models/organization.py
@@ -0,0 +1,94 @@
+from django.contrib.auth import get_user_model
+from django.db import models
+from django.utils.translation import gettext_lazy as _
+
+
+class Organization(models.Model):
+    name = models.CharField(max_length=100, verbose_name=_("Name"))
+
+    billing_entity = models.ForeignKey(
+        to="BillingEntity",
+        on_delete=models.PROTECT,
+        related_name="organizations",
+        verbose_name=_("Billing entity"),
+    )
+    origin = models.ForeignKey(
+        to="OrganizationOrigin",
+        on_delete=models.PROTECT,
+        related_name="organizations",
+        verbose_name=_("Origin"),
+    )
+
+    members = models.ManyToManyField(
+        to=get_user_model(),
+        through="OrganizationMembership",
+        related_name="organizations",
+        verbose_name=_("Members"),
+    )
+
+    def __str__(self):
+        return self.name
+
+
+class BillingEntity(models.Model):
+    """
+    Every organization has a billing entity, though billing entities
+    may be shared across different organizations.
+    """
+
+    name = models.CharField(max_length=100, verbose_name=_("Name"))
+    description = models.TextField(blank=True, verbose_name=_("Description"))
+    erp_reference = models.CharField(
+        max_length=100, blank=True, verbose_name=_("ERP reference")
+    )
+
+    def __str__(self):
+        return self.name
+
+
+class OrganizationOrigin(models.Model):
+    """
+    Every organization has an origin, though origins may be
+    shared across different organizations.
+    """
+
+    name = models.CharField(max_length=100, verbose_name=_("Name"))
+    description = models.TextField(blank=True, verbose_name=_("Description"))
+
+    def __str__(self):
+        return self.name
+
+
+class OrganizationRole(models.TextChoices):
+    MEMBER = "member", _("Member")
+    ADMIN = "admin", _("Administrator")
+    OWNER = "owner", _("Owner")
+
+
+class OrganizationMembership(models.Model):
+    """Through-model for the many-to-many relationship between organizations and users."""
+
+    user = models.ForeignKey(
+        to=get_user_model(),
+        on_delete=models.CASCADE,
+        related_name="organization_memberships",
+        verbose_name=_("User"),
+    )
+    organization = models.ForeignKey(
+        to=Organization,
+        on_delete=models.CASCADE,
+        related_name="memberships",
+        verbose_name=_("Organization"),
+    )
+    date_joined = models.DateTimeField(
+        verbose_name=_("Date joined"), auto_now_add=True, editable=False
+    )
+    role = models.CharField(
+        max_length=20,
+        choices=OrganizationRole.choices,
+        default=OrganizationRole.MEMBER,
+        verbose_name=_("Role"),
+    )
+
+    def __str__(self):
+        return f"{self.user} in {self.organization} as {self.role}"