Harold Le Roy McKain (July 10, 1906 – January 24, 1970) was an American professional baseball pitcher who played in Major League Baseball for five seasons.

He played for the Cleveland Indians in 1927 and the Chicago White Sox from 1929 to 1932.

After being a pitcher, McKain served as a retail sales manager in Sacramento, California.

[1] McKain died on January 24, 1970 of a sudden heart attack at the age of 63.

This biographical article relating to an American baseball pitcher born in the 1900s is a stub.