William McArthur
William McArthur may refer to:
- William Pope McArthur, US naval officer and hydrologist
- William McArthur (lord mayor of London), Irish businessman, MP and Lord Mayor of London
- William Alexander McArthur, British politician
- William S. McArthur, US astronaut
- Sir William MacArthur (British Army officer), Director General Army Medical Services
- Bill McArthur (American football), American football player and coach