Bob Cronin, better known by the stage name dj BC, is an American disc jockey and Mashup record producer.

BC's work has been heard from the radio stations in Boston and New York City to stations in Paris and Athens. He founded a mash-up night in Boston, known as Mash Ave, in 2004, and founded the popular Bootie Boston in 2007. He now serves as a resident DJ at the mash-up night Bootie ATL in Atlanta.