Alfonso XIII (1886–1941) was a king of Spain.
Alfonso XIII may refer to:
- Spanish cruiser Alfonso XIII, a Spanish Navy cruiser of the late 19th and early 20th centuries
- Spanish battleship Alfonso XIII, a Spanish Navy dreadnought battleship in commission from 1915 to 1937
- Alfonso XIII (Madrid Metro), a station on the Madrid Metro
- Alfonso XIII Tunnel, one of the Vielha Tunnels in north-west Catalonia
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