USS ''Polaris'' is a name used more than once by the

United States Navy The United States Navy (USN) is the naval warfare, maritime military branch, service branch of the United States Department of Defense. It is the world's most powerful navy with the largest Displacement (ship), displacement, at 4.5 millio ...

: * , a converted Civil War screw steamer used on the ''Polaris'' expedition * , built in 1939 as SS ''Donald McKay'' and acquired from the

Maritime Commission The United States Maritime Commission was an independent executive agency of the U.S. federal government that was created by the Merchant Marine Act of 1936, which was passed by Congress on June 29, 1936, and was abolished on May 24, 1950. The c ...

on 27 January 1941

See also