James Patrick Brosnan (October 24, 1929 – June 28, 2014) was an American baseball player and author who played in Major League Baseball in 1954 and from 1956 through 1963. A right-handed pitcher, he appeared in 385 games, largely in relief, for the Chicago Cubs, St. Louis Cardinals, Cincinnati Reds and Chicago White Sox. Brosnan was listed as 6 feet 4 inches (1.93 m) tall and 197 pounds (89 kg).

During his career, Brosnan was known as an intellectual, for keeping books in his locker to read and for his personal habits of puffing on a pipe while wearing his glasses, reading books during games. His teammates often referred to him as "The Professor". He attended Xavier University.