Which one is correct?
I think you've mistaken me with someone else. and I think you've mistaken me for someone else.

Question

Which one is correct?
I think you've mistaken me with someone else.  and  I think you've mistaken me for someone else.

Answer

The second one is correct. You mistake someone for someone else. You mix someone up with someone else.

Answer

Yes  Susan is correct.

" I think you've mistaken me for someone else."   is the correct one..