Walter Donald Aloysius Signer (October 12, 1910 – July 23, 1974) was a Major League Baseball pitcher who played for the Chicago Cubs in 1943 and 1945.

[1] Signer is one of many ballplayers who only appeared in the major leagues during World War II.

[2] He made his major league debut on September 18, 1943, starting the second game of a doubleheader against the St. Louis Cardinals at Sportsman's Park.

Signer's first major league win came as a relief pitcher in an 8–7 victory over the Philadelphia Blue Jays at Wrigley Field (September 23, 1943).

This biographical article relating to an American baseball pitcher born in the 1910s is a stub.