Arriaga is a Basque surname that may refer to:
- Guillermo Arriaga, Mexican author, screenwriter and producer
- Fr. Joaquín Sáenz y Arriaga, S.J., Mexican theologian, sedevacantist
- Juan Crisóstomo Arriaga 1806–1826, Basque-Spanish composer
- Teatro Arriaga, opera house in Bilbao, commemorates him
- Manuel de Arriaga 1840–1917, president of Portugal
- Ponciano Arriaga, 19th-century Mexican politician
- Kaúlza de Arriaga, commander of Portuguese troops in the Mozambican War of Independence
- Ponciano Arriaga International Airport, serves San Luis Potosí
- Arriaga, Chiapas, town in southern Mexico