Single deity belief

[MorningFate]

Does anyone know what it might be called or categorized in if you only had belief in the goddess?

[Sercee]

Dianic Tradition, perhaps?

[Storm]

I'd have to class myself as strongly leaning towards being Dianic.

[Sercee]

I don't classify myself that way, and I doubt I ever will, but from a few things that came up today I'm starting to lean that way.

[vonigan]

monotheism

: the doctrine or belief that there is but one God (or in your case: goddess)

I believe it would be something similar to this.
I guess it kind of depends on if you mean one specific goddess or the archetype, even though they are one and the same to me and others that I know. the archetype thing kind of sounds redundant to me but you know what I'm trying to say. maybe you should be a little more specific with your question, if possible.