Treaty of San Ildefonso may refer to:
- First Treaty of San Ildefonso of 1777 between Spain and Portugal
- Second Treaty of San Ildefonso of 1796 between Spain and France, allying the two nations
- Third Treaty of San Ildefonso of 1800 between Spain and France, by which Spain returned Louisiana to France
See also
edit- San Ildefonso, a town in central Spain
- Royal Palace of La Granja de San Ildefonso, the summer residence of the Kings of Spain
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