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.

This biographical article relating to an American baseball catcher born in the 1890s is a stub.