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You can apply the order_by and distinct methods in Django's ModelChoiceField for forms by using the queryset parameter.

Here is an example:

# models.py
class Author(models.Model):
    name = models.CharField(max_length=100)

class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.ForeignKey(Author, on_delete=models.CASCADE)

# forms.py
class BookForm(forms.Form):
    author = forms.ModelChoiceField(
        queryset=Author.objects.all().distinct().order_by('name')
    )

# views.py
def my_view(request):
    form = BookForm()
    return render(request, 'my_template.html', {'form': form})

In the above example, we are applying the order_by method on the name field of the Author model and the distinct method on the queryset to remove any duplicate author names.