Harry Lester Wilhelm (April 7, 1874 – February 20, 1944) was an American pitcher in Major League Baseball for the 1899 Louisville Colonels.

He began his professional career with the Carlisle Colts and Chambersburg Maroons of the independent Cumberland Valley League in 1896.

His best season in the minors was in 1899 when he had a record of 21–10 in 32 games for the Lancaster Maroons of the Atlantic League.

While he was in the minors, he played a variety of positions.

This biographical article relating to an American baseball pitcher born in the 1870s is a stub.