Me

Heehee, my first thought was "me" too but that was sheer sarcasm so didnt dare post it.
HHhmmm, this is a toughy, I would definitely go with Mother Theresa but she's not around any more and wouldn't really be classed as a 'celebrity' here, so at the moment I'm going for Angelina Joli.
But no doubt soon enough I will be reading about some other amazing woman!

Since I can't actually decide what the 'best woman in the world' is supposed to mean, I'll opt for an actresss (since this is the Celebrity forum).

Jenny Agutter

If this turns into a lustful thread (i.e. all the blokes choosing a woman 'celebrity' that they fancy the most), I'm quite partial to musician Nicky Mehta

I'm still voting ME!!!!

Well id vote for you 2 cheeky but at this precise moment it has to be my all time female woman crush Monica Belluchi.

i say kat deluna

The one you choose to marry.

OK, you may or may not have regrets later but at the time she was the best or you wouldn't marry her.