Who rated me?

@bderoes could you please clarify what you mean by 'even then the true identity is not revealed?'

Reason I'm asking is because I have a feeling a specific person is giving low ratings to short film project me and my colleagues have been working on, maybe out of spite. There seems to be a pattern over several projects and it would be helpful to find out who this person might be. But I'm guessing this is not possible?

The only thing you know about a user on IMDb is what they choose to reveal.

Very few share any external information.

And IMDb does not share anything beyond what the user has placed on their Activity/Profile page.

Sometimes people use the same user id on IMDb as they have elsewhere, so if you see a negative review, you might want to try some searches, but I wouldn't expect much.