Alexander Joseph Rummler (July 25, 1867 – 1959) was an American painter.

Rummler was born in Dubuque, Iowa, to German immigrants Joseph and Rosalia Rummler. In 1888 Rummler traveled to New York to study art at the Art Students League of New York. In 1905 Rummler moved with his wife, Maria, and their children to Europe to further study painting at the Académie Julian in Paris with Jean-Paul Laurens.

Rummler became known nationwide at the end of World War I when his painting of the signing of the armistice was displayed on billboards.

Rummler moved to South Norwalk, Connecticut, in 1907. In 1926 he was chosen to represent Connecticut in the Philadelphia Exposition of 1926, where his paintings took first place.

In 1936 Rummler began working for the Works Progress Administration painting murals for the then still under construction Norwalk High School. Rummler painted sixteen murals and eight smaller panels depicting Norwalk life. During this time he also served as town treasurer of Norwalk. In 1942 Rummler moved to Stamford, Connecticut. Rummler died at the age of 92 in 1959.