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