Not as of right now, but maybe in the future if you have the right software(s).
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If you mean the orignal battlefield game (Battlefield 1942), then no, you do not, it is a standalone game.
Battlefield 2/python/stats/bf2/unlocks.py
You buy it for mac. You can get it at a mac store.
March 2.
The newest one out so far sharing the Battlefield name is Battlefield Bad company 2, the next one ive heard of that hasn't been made yet is Battlefield 3. (I cant wait for it!)