Henry Girard Ostdiek (April 12, 1881 – May 6, 1956) was a reserve catcher in Major League Baseball who played for the Cleveland Naps (1904) and Boston Red Sox (1908) during his major league career. Listed at 5ft 11in, 185 lb, Ostdiek batted and threw right-handed. He was born in Ottumwa, Iowa. In an eight-game career, Ostdiek was a .143 hitter (3-for-21) with three RBI, one run, and one triple without a home run. In eight catching appearances, he posted a .935 fielding percentage, committing three errors in 46 chances. Ostdiek died at the age of 75 in Minneapolis, Minnesota.