You can, with either:
a) An adapter with glass in it. Buy one for $20 off ebay, and your photos will look hopeless. Buy the original canon one (maybe for a few hundred $) and your photos will look ok. Some companies make adapters with glass in that aren't bad, but I don't know who they are (Hartblei make them, and Hartblei make other good quality optics, so maybe they're not so bad, don't blame me if they're not).
b) An adapter with no glass in it, and you won't be able to focus to infinity. Depending on how thin it is, you may be able to take portraits from a few meters away, or you may be limited to macro shots only.
c) Wait for EdMika to make an adapter. Read this. Currently there's only adapters for the FD TS 35mm, the FL 55mm f/1.2 (i've got one of these and highly recommend it), the FD 55mm f/1.2 (SSC and Chrome-Nose), and for anything 200mm or longer. See here for his stuff.