Patrick A. McManus (October, 1859 – May 19, 1917) was a Major League Baseball pitcher during part of the 1879 season. He was a native of Ireland. McManus started and completed two games for the Troy Trojans of the National League. He gave up just 25 baserunners (24 hits and 1 walk) in 21 innings. He also gave up 21 runs, but only 7 of them were earned runs. One of his teammates on the 1879 Trojans was Hall of Famer Dan Brouthers. In McManus's short MLB career, he was 0–2 with 6 strikeouts, 1 walk, and an ERA of 3.00. He died at the age of 57 in Mount Hope, New York.