William McArthur

William McArthur may refer to:

• William Pope McArthur (1814–1850), US naval officer and hydrologist
• William McArthur (lord mayor of London) (1809–1887), Irish businessman, MP and Lord Mayor of London
• William Alexander McArthur (1857–1923), British politician
• William S. McArthur (born 1951), US astronaut
• Sir William MacArthur (British Army officer), Director General Army Medical Services
• Bill McArthur (American football), American football player and coach