Samuel Adams Ettelson (November 19, 1874 – May 9, 1938) was an American lawyer and politician.

He served in the Illinois Senate representing the 3rd District in Chicago from 1906 through 1918.

Born in Chicago, Illinois, Ettelson graduated from West Division High School.

Ettelson served as corporation counsel for the city of Chicago.

Ettelson died at Michael Reese Hospital from complications from surgery.