Harry John Arndt (February 12, 1879 – March 25, 1921) was a Major League Baseball (MLB) second baseman.

He was born on February 12, 1879, in South Bend, Indiana.

He played four seasons, with the Detroit Tigers, Baltimore Orioles, and St. Louis Cardinals.

[1] Arndt died on March 25, 1921, in his home town of South Bend.

This biographical article relating to an American baseball second baseman is a stub.