USS ''Merrimack'', or variant spelling USS ''Merrimac'', may be any one of several ships commissioned in the United States Navy and named after the
Merrimack River
The Merrimack River (or Merrimac River, an occasional earlier spelling) is a river in the northeastern United States. It rises at the confluence of the Pemigewasset and Winnipesaukee rivers in Franklin, New Hampshire, flows southward into Mas ...
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*, a ship placed in service in 1798 and sold into mercantile service in 1801, renamed ''Monticello'' as a merchant ship and later sunk off Cape Cod
*, a brig laid down as USS ''Merrimack'' in 1803 but renamed prior to completion
* a screw frigate commissioned in 1856, decommissioned in 1860, and burned in 1861 to prevent capture by the Confederate States of America, best known as the hull upon which the Confederate States Navy ironclad was built during the American Civil War
*, a side-wheel steamer purchased in 1864 that foundered in 1865
*, a collier purchased in April 1898 and sunk as a blockship in June 1898 during the Spanish–American War
*, a ''Kennebec''-class fleet oiler in commission from 1942 to 1950 and again from 1950 to 1954 which served in both the Atlantic and Pacific during World War II
*, a ''Cimarron''-class fleet oiler in commission from 1981 to 1998
{{DEFAULTSORT:Merrimack
United States Navy ship names