USS Monadnock may refer to:
, was a double-turret monitor

Monitor (warship)

A monitor was a class of relatively small warship which was neither fast nor strongly armoured but carried disproportionately large guns. They were used by some navies from the 1860s until the end of World War II, and saw their final use by the United States Navy during the Vietnam War.The monitors...

commissioned in October 1864 and decommissioned June 1866
, was an commissioned in September 1883 and decommissioned March 1919
, was acquired by the US Navy in June 1941 and sold in 1949
, was acquired by the US Navy in March 1951 and removed from the Navy List in July 1960