Arthur MacArthur III
| Arthur MacArthur III | |
|---|---|
| Born | June 1, 1876 | 
| Died | December 2, 1923 (aged 47) Washington, D.C., US | 
| Buried | |
| Allegiance | United States | 
| Branch | United States Navy | 
| Years of service | 1896–1923 | 
| Rank | Captain | 
| Commands | |
| Battles / wars | |
| Awards | |
| Spouse(s) | Mary Hendry McCalla (m. 1902) | 
| Children | 5, including Douglas | 
| Relations | Arthur MacArthur Jr. (father) Douglas MacArthur (brother) See MacArthur family | 
Arthur MacArthur III (June 1, 1876 – December 2, 1923) was a United States Navy officer, whose active-duty career extended from the Spanish–American War through World War I. He was the oldest brother of General Douglas MacArthur (1880–1964).