Patrick Henry O'Loughlin (1860–1927) was an Irish born 19th-century outfielder who played in Major League Baseball. Sometimes credited as Patrick Loughlin or simply "Loughlin", he appeared in one game at right field for the 1883 Baltimore Orioles of the American Association. In that game, he got two hits in five at bats.

• Patrick O'Loughlin at Baseball Reference
• Patrick Loughlin at Retrosheet