Kevin Eugene Hagen (born March 8, 1960 in Renton, Washington) is a former pitcher in Major League Baseball who played from 1983 through 1984 for the St. Louis Cardinals. Hagen batted and threw right-handed. He attended Bellevue Community College.
In a two-season career, Hagen posted a 3-2 record with a 4.25 ERA in 13 appearances, including four starts, giving up 17 runs (three unearned) on 43 hits and eight walks while striking out nine in 29 ⅔ innings of work.