USS Pittsburgh was a City-class ironclad gunboat constructed for the Union Army by James B. Eads during the American Civil War, and transferred to the Union Navy in October 1862. She was commissioned in January 1862, Commander Egbert Thompson in command.

The Pook Turtles, or City-class gunboats to use their semi-official name, were war vessels intended for service on the Mississippi River during the American Civil War. They were also sometimes referred to as "Eads gunboats." The labels are applied to seven vessels of uniform design built from the keel up in Carondelet, Missouri shipyards owned by James Buchanan Eads. Eads was a wealthy St. Louis industrialist who risked his fortune in support of the Union.