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 5 ft 11 in (1.80 m), 185 pounds (84 kg), Ostdiek batted and threw right-handed.

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.

This biographical article relating to an American baseball catcher born in the 1880s is a stub.