吉大港（孟加拉语：চট্টগ্রাম,）是孟加拉国第二大城市以及第一大港，吉大港区的首府，人口约390万人，还在不断增长，临孟加拉湾，位在戈尔诺普利河右岸。吉大港是孟加拉的重要交通枢钮和工业中心，工业有炼油、造船、钢铁、纺织、玻璃及食品加工等，而其拆船回收业格外出名，该拆船厂区供应了本国75%金属来源。它位于孟加拉国的东南部，周围被丘陵环绕。吉大港山区位于附近。

吉大港最重要的港口，孟加拉国几乎所有进出口通过吉大港，因此它是孟加拉国的经济中心，生产该国相当大比例的国民生产总值。它的港口大量使用先进的港口设施，部分适合远洋轮。

Chittagong /tʃɪtəɡɒŋ/ (Bengali:চট্টগ্রাম Bengali pronunciation: [tʃɔt̠t̠ɔgram]; Porto Grande de Bengala; Mughal Islamabad) is a major coastal seaport city and financial centre in southeastern Bangladesh. The city has a population of more than 2.5 million while the metropolitan area has a population of over 6.5 million, making it the second largest city in the country. It is the capital of an eponymous district and division. The city is located on the banks of the Karnaphuli River between the Chittagong Hill Tracts and the Bay of Bengal.