Juan Manuel Alonso-Allende Allende (8 December 1918 – 10 March 1984) was a Spanish Olympic sailor that competed in three Olympic Games between 1948 and 1968.
Alonso-Allende also was a world-class competitor in the Snipe, Star, Firefly and Flying Dutchman classes.
He won the Snipe class world championship in 1957.