Frank Aloysius "Dink" O'Brien (September 13, 1894 – November 4, 1971) was a professional baseball player. He was a catcher for one season (1923) with the Philadelphia Phillies. For his career, he compiled a .333 batting average in 21 at-bats.
O'Brien was born in San Francisco, California and later died in Monterey Park, California at the age of 77.