| William Mervine | |
| Birth Date: | 14 March 1791 |
| Placeofburial Label: | Place of burial |
| Birth Place: | Philadelphia, Pennsylvania, U.S. |
| Death Place: | Utica, New York, U.S. |
| Branch: | United States Navy |
| Serviceyears: | 1809–1861 |
| Rank: | Rear admiral |
| Commands: | USS Savannah Gulf Blockading Squadron |
| Battles: | War of 1812 Mexican–American War American Civil War |
William Mervine (14 March 1791 – 15 September 1868) was a rear admiral in the United States Navy, whose career included service in the War of 1812, the Mexican–American War and the American Civil War.
Born in Philadelphia, Pennsylvania, Mervine was appointed midshipman in January 1809. Serving on Lake Ontario during the War of 1812, he later cruised off Africa and South America, in the West Indies and in the Pacific.
While in command of the during the war with Mexico, 1846 and 1847, he led a detachment of sailors and United States Marines against Monterey, California, and on 7 July 1846, took possession and hoisted the American flag over the city. On 7–9 October 1846, Mervine led 203 U.S. Marines, 147 American sailors, and volunteers in the invasion of Los Angeles where he lost the Battle of Dominguez Rancho. Fourteen Marines were killed. José Antonio Carrillo, a Californio rancher, led 50 Spanish Californio lancers in that defeat of Mervine and the American forces.[1]
On 7 May 1861, Secretary of the Navy Gideon Welles appointed the 70-year-old Captain Mervine to command the Gulf Blockading Squadron within the Gulf of Mexico. The assignment was difficult and arduous. Ship Island, MS was deemed to be "indispensable" and must be taken to control the maritime traffic. However on 22 September 1861, he was removed as commander of the blockade force by Secretary of the Navy Gideon Welles. He stated he found it "difficult to understand the reasons for the apparent inactivity and indifference that have governed in this matter. You have large ships, heavy batteries, and young and willing officers, with men sufficient to dispossess the insurgents from Ship Island." Captain Mervine's removal was seconded by the fact that he had been suffering from illness. He was reassigned and worked until late 1865.
He died at Utica, New York on 15 September 1868 at the age of 77 years. He is buried at the Forest Hill Cemetery located in Utica.
The Navy has named two destroyers in his honor.