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