加兹温（波斯文：قزوین‎）是伊朗伊斯兰共和国加兹温省省会和最大城市，曾一度为波斯帝国萨非王朝的首都。

Qazvin (/kæzˈviːn/; Persian:قزوین‎‎, IPA: [ɢæzˈviːn], also Romanized as Qazvīn, Caspin, Qazwin, or Ghazvin) is the largest city and capital of the Province of Qazvin in Iran. Qazvin was an ancient capital in the Persian Empire and nowadays is known as the calligraphy capital of Iran. It is famous for its Baghlava, carpet patterns, poets, political newspaper and pahlavi (Middle Persian) influence on its accent. At the 2011 census, its population was 381,598.