Diego Ruiz may refer to:
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Diego Ruiz (skier) (born 1977), Spanish cross-country skier
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Diego Ruiz (footballer) (born 1980), Argentine footballer
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Diego Ruiz (runner) (born 1982), Spanish middle-distance runner
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Diego Ruiz de Montoya (1562–1632), Spanish Jesuit theologian
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Quas (video gamer) or Diego Ruiz
{{hndis, Ruiz, Diego