Hajdú and Hajdu may refer to:
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Hajdu, mercenary soldiers in 16th- and 17th-century Hungary
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Hajdú (county), a historical county in the Kingdom of Hungary
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Hajdú-Bihar, a modern county in eastern Hungary
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Hajdu–Cheney syndrome, an extremely rare genetic disorder of the connective tissue
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Hajdú, a surname:
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Andre Hajdu (1932–2016), Israeli composer born in Hungary
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David Hajdu (born 1955), American columnist
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Étienne Hajdú (1907–1996), Transylvania-born French sculptor
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Georg Hajdu (born 1960), German composer and music theorist
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Markéta Hajdu (born 1974), Czech hammer thrower
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Patty Hajdu (born 1966), Canadian politician
