USS Manhattan was a single-turreted Canonicus-class monitor built for the Union Navy during the American Civil War.

A "rifle screen" of 1⁄2-inch (13 mm) armor 3 feet (0.9 m) high was installed on the top of the turret to protected the crew against Confederate snipers based on a suggestion by Commander Tunis A. M. Craven, captain of her sister ship Tecumseh.

[9] After commissioning, Manhattan steamed for the Gulf of Mexico and arrived at the Pensacola Navy Yard on 7 July, towed by the side-wheel gunboat Bienville.

The ship reached Mobile Bay on 20 July, again towed by Bienville, where it joined the West Gulf Blockading Squadron.

[10] Shortly after Tecumseh's arrival on 4 August, Rear Admiral David G. Farragut, the squadron commander, briefed his captains on his plan for the next day's battle.

Manhattan and Tecumseh were to keep the ironclad ram Tennessee away from the vulnerable wooden ships while they were passing the fort and then sink her.

Nicholson claimed four hits, including the shot that broke the Tennessee's steering chains and another that jammed her stern gun port shutter in the closed position.

[13] Manhattan had closed to about 50 yards (46 m) distance when Nicholson spotted a white flag of surrender hanging from a boat hook on top of the Tennessee's casemate and ordered his gunners to cease fire.

Nicholson confirmed the Confederate ship's surrender verbally and ran the monitor alongside so that one of his officers could seize the ironclad's colors, which was lying in her scuppers.

In November, Manhattan sailed to New Orleans, Louisiana and later to the mouth of the Red River, where she remained until the end of the war.

Recommissioned on 19 November 1873, the ship returned to Key West for fleet maneuvers and then proceeded to Pensacola, Florida.