> For the complete documentation index, see [llms.txt](https://olee-tech.gitbook.io/django/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://olee-tech.gitbook.io/django/django-orm/model-relationships-and-related-names/one-to-one-relationships.md).

# One-to-One Relationships

### One-to-One Relationships <a href="#id-1b20" id="id-1b20"></a>

One-to-one relationships are often used when two models share a unique relationship. For example, let’s say we have a **Profile** model associated with a **User** model. Each user should have exactly one profile, and each profile belongs to a single user. In Django, you can define a one-to-one relationship using the **OneToOneField**:

```python
from django.db import models
from django.contrib.auth.models import User


class Profile(models.Model):
  user = models.OneToOneField(User, on_delete=models.CASCADE, related_name="profile")
  bio = models.TextField()
  website = models.URLField()
```