John Williams (c. 1831October 30, 1899) was an American sailor who was awarded the Medal of Honor for his actions during the American Civil War.
Williams was born in about 1831 in Elizabethtown, New Jersey. He served as a Boatswain's Mate aboard the USS Mohican. He earned his medal in action on November 7, 1861, at Hilton Head, South Carolina. He died in Brooklyn, New York on October 30, 1899, and is now buried in the Holy Cross Cemetery.