A number of ships have been named Sierra including:
Merchant ships
- , an American trans-Pacific passenger liner, which also served as USS Sierra
- Sierra (1944), an American cargo ship between 1947 and 1961, formerly United States Navy attack cargo ship
Naval ships
- , the former merchant ship Sierra, built 1900, in commission as a troop transport from 1918 to 1919
- , a destroyer tender in commission from 1944 to 1994
- , a ship class of the Mexican Navy
- , a Russian class of nuclear-powered attack submarines
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