Hatvani/Hatvany is a Hungarian surname. The name derives from Hatvan, Hungary. It may refer to:
Hatvani István Hatvani (1718–1786), Hungarian mathematician, scientist Mihály Hatvani, a penname of Mihály Horváth (1809–1878)
Hatvany Sándor Hatvany-Deutsch (1852–1913), Hungarian industrialist Ferenc Hatvany (1881–1958) Béla Hatvany (1938–), Entrepreneur Baroness Katalin Hatvany de Hatvan (1947–), Hungarian designer
See also List of titled noble families in the Kingdom of Hungary