Clarence Henry "Kleggie" Hermsen (March 12, 1923 – March 2, 1994) was an American professional basketball player. A 6-foot-9 center from the University of Minnesota, Hermsen began his professional career with the Sheboygan Red Skins of the National Basketball League in 1943–44 and 1945–46. He scored 11 points in 12 games during his rookie campaign, but played a greater role in his second season, scoring 55 points in 21 games. Both Red Skins teams advanced to the NBL championship series — losses to the Fort Wayne Zollner Pistons and Rochester Royals.