How can I hide a django label in a custom django form?

I wouldn't recommend removing the label as it makes the form inaccessible. You could add a custom CSS class to the field, and in your CSS make that class invisible.

EDIT

I missed that the input was hidden so accessibility isn't a concern.

You can render the form fields directly in your template:

<form ...>
    {% for field in form.hidden_fields %}
        {{ field }}
    {% endfor %}

    {% for field in form.visible_fields %}
        {{ field.label }} {{ field }}
    {% endfor %}
</form>

Now,(my django version is 2.1.4), you can solve in this way -> Edit forms.py file:

password = forms.CharField(label=False)