Alfonso de Orleans y Borbón, Infante of Spain, Duke of Galliera (12 November 1886 – 6 August 1975) was a Spanish military aviator and first cousin of Alfonso XIII of Spain.

Alfonso was born in Madrid, Spain, the elder son of Infante Antonio, Duke of Galliera and his wife, Infanta Eulalia of Spain. On his paternal side he was a grandson of Antoine, Duke of Montpensier, while on his maternal side he was a grandson of Queen Isabella II of Spain. On 30 November 1886, in the Royal Palace of Madrid, he was baptised with the names Alfonso María Francisco Antonio Diego.

In 1899 Alfonso and his younger brother Luis Fernando were sent to England to be educated by the Jesuits at Beaumont College. They remained there until 1904.

In 1906 Alfonso graduated from the Academia Militar de Toledo (Military Academy of Toledo). In 1910 he trained as a pilot in France. Upon returning to Spain, be successfully become one of the first and most distinguished aviators in the Spanish military. He served as chief of aerial operations for the 1925 amphibious landings at Al Hoceima in Morocco.

In May 1930 Alfonso was a passenger on the Graf Zeppelin flight from Seville to Brazil. He then continued in the Graf Zeppelin to New York City and visited President Herbert Hoover in Washington, D.C., before returning to Spain.

On 27 February 1931, Alfonso was named Chief of Staff of the Spanish Air Force and Commander of the First Aero District by his cousin King Alfonso XIII.

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