Sidney A. Sage, Jr. (December 26, 1852 – August 2, 1909) was an American businessman and politician.
Born in Racine, Wisconsin, Sage went to Beloit College.
Sage was a hay merchant and dealer in agricultural implements in Corliss, Wisconsin.
Sage served in the Wisconsin State Assembly in 1881 and was a Republican.
This article about a Republican Party member of the Wisconsin State Assembly born in the 1850s is a stub.