Harley Francis Flanagan is an American musician. He is currently the bassist, vocalist and sole remaining founding member of New York hardcore band the Cro-Mags.

Cro-Mags are an American hardcore punk band from New York City. The band, which has a strong cult following, has released six studio albums, with the first two considered the most influential. With a Hare Krishna background, they were among the first bands to fuse hardcore punk with thrash metal.