Sieradz Land (Polish: ziemia sieradzka; Latin: Terra Siradiae) is a historical region in central Poland, a part of Łęczyca-Sieradz Land (Polish: ziemia łęczycko-sieradzka).
Its traditional capital is Sieradz, while other bigger cities are Piotrków Trybunalski (another historically important locality), Radomsko, Tomaszów Mazowiecki (partly in Łęczyca Land), Bełchatów, Zduńska Wola, and Pabianice (a suburb of Łódź).