William Nelson
William Nelson may refer to:
- Billy Bass Nelson, American musician
- Billy Nelson (actor), American vaudeville comedian and actor
- Billy Nelson (runner), American steeplechaser
- Billy Nelson (boxer), Scottish boxing coach and former boxer
- William Nelson (governor), American colonial governor of Virginia
- William Nelson (British judge), British district judge
- William Nelson (MP), member of parliament for the City of York
- William Nelson (New York politician), U.S. congressman for New York
- William Nelson (Wisconsin politician), member of the Wisconsin State Senate
- William Nelson (wrestler), American wrestler who won a bronze medal at the 1904 Olympics
- William Nelson, 1st Earl Nelson, elder brother of Horatio Nelson, 1st Viscount Nelson
- William "Bull" Nelson, Union army general in the American Civil War
- William E. Nelson, murdered by his wife Omaima Nelson
- William G. Nelson, American cancer researcher and professor
- Harold Nelson (athlete), New Zealand runner
- William L. Nelson (politician), U.S. congressman for Missouri
- William L. Nelson (Medal of Honor), World War II Medal of Honor recipient
- William Lambie Nelson, member of the Queensland Legislative Assembly
- William T. Nelson, U.S. Navy rear admiral
- William Rockhill Nelson, American journalist and publisher
- William Nelson (industrialist), New Zealand farmer and industrialist
- William Nelson (inventor), American inventor killed by own invention
- William Nelson Jr., Virginia politician, professor, lawyer and judge, son of William Nelson (governor)