USS Ohio (BB-12), a Maine-class pre-dreadnought battleship, was the third ship of her class and the third ship of the United States Navy to be named for the 17th state. She was laid down at the Union Iron Works shipyard in San Francisco in April 1899, was launched in May 1901, and was commissioned into the fleet in October 1904. She was armed with a main battery of four 12-inch (305 mm) guns and could steam at a top speed of 18 knots (33 km/h; 21 mph).