Frank S. "Terry" Larkin (1856[1] – September 16, 1894) was a Major League Baseball pitcher who played for five teams during a six-season career.

[1] Larkin, a right-hander, debuted on May 20, 1876 for the New York Mutuals, pitching a complete game in his only appearance of the season.

Larkin was a good hitter for a pitcher and finished 8th in the National League with 32 runs batted in (RBI), while hitting for a .288 average in 1878.

"[3] In August of that year, he was sent to prison for six months after being accused of beating his wife.

[5] Larkin was later institutionalized after challenging his former employer to a duel with pistols, and while apparently still hospitalized committed suicide[6] by slitting his throat with a razor on September 16, 1894 in Brooklyn, New York.