CSS Shenandoah, formerly Sea King and later El Majidi, was an iron-framed, teak-planked, full-rigged sailing ship with auxiliary steam power chiefly known for her actions under Lieutenant Commander James Waddell as part of the Confederate States Navy during the American Civil War.Shenandoah was originally a British merchant ship launched as Sea King on August 17, 1863, but was later repurposed as one of the most feared commerce raiders in the Confederate Navy. For twelve-and-a-half months from 1864 to 1865, the ship undertook commerce raiding around the world in an effort to disrupt the Union's economy, which resulted in the capture and the sinking or bonding of 38 merchant vessels, mostly whaling ships from New Bedford, Massachusetts. She finally surrendered on the River Mersey, Liverpool, United Kingdom, on November 6, 1865, six months after the war had ended. Her flag was the last sovereign Confederate flag to be officially furled.

Shenandoah is also known for having fired the last shot of the Civil War, across the bow of a whaler in waters off the Aleutian Islands.