Jan Zamoyski (1542–1605) was a Polish magnate, grand chancellor and grand hetman of the Crown.
Jan Zamoyski may also refer to: Jan Jakub Zamoyski (1716–1790), Polish magnate, voivode of Podolia Jan Kanty Zamoyski (1900–1961), Polish aristocrat Jan Tomasz Zamoyski (1912–2002), Polish politician Jan Zamoyski (died 1619), Polish magnate, castellan of Chełm Jan Zamoyski (1627–1665) or Sobiepan, Polish magnate, voivode of Kiev and Sandomierz