Isidoro León Becerra (January 4, 1911 – July 25, 2002) was a Major League Baseball pitcher who played for the Philadelphia Phillies in 1945.

León is one of many ballplayers who only appeared in the major leagues during World War II.

He made his major league debut on June 21, 1945, in a home game against the Brooklyn Dodgers at Shibe Park.

León's final big league appearance was on September 16.

This biographical article relating to a Cuban baseball pitcher is a stub.