Ernest Matthias Alten (December 1, 1894 – September 9, 1981), nicknamed "Lefty", was a Major League Baseball pitcher.

Alten played for the Detroit Tigers in the 1920 season.

In 14 career games, he had a 0–1 record with a 9.00 ERA.

He batted right and threw left-handed.

This biographical article relating to an American baseball pitcher born in the 1890s is a stub.