Chittagong ko Chattogram (da harshen Bengal: চট্টগ্রাম) birni ne, da ke a ƙasar Bangladesh. Bisa ga ƙidayar jama'a a shekarar 2016, jimilar mutane miliyan biyu da dubu dari biyar. An gina birnin Chittagong kafin karni na huɗu kafin haihuwar Annabi Issa. Filin jirgin saman Chittagong