The Ruy Lopez (/rʊ.ɪ ˈloʊpɛz/; Spanish pronunciation: [ˈruj ˈlopeθ/ˈlopes]), also called the Spanish Opening or Spanish Game, is a chess opening characterised by the moves:

The Ruy Lopez is named after 16th-century Spanish priest Ruy López de Segura. It is one of the most popular openings, with such a vast number of variations that in the Encyclopaedia of Chess Openings (ECO) all codes from C60 to C99 are assigned to them.