金奈（泰米尔语：சென்னை，印地语：चेन्नई，拉丁化：Chennai），比较接近印度音的汉语译音为“真奈”，原名「马德拉斯」（英语：Madras， 发音），是印度东南部的一座大型城市，地处乌木海岸，紧邻孟加拉湾，由英国殖民者于17世纪所创建，并被逐渐发展成为相应区域的主要中心城市和海军基地，不仅是过去英属印度马德拉斯省的首府，也是现今泰米尔纳德邦的首府和（自20世纪以来的）重要行政中枢。虽然该市在1996年被改为现名，但基于本身固有文化的强大影响力，加上其市郊和市内部份地区（如Triplicane）就已经有将近2000年的历史，其旧称「马德拉斯」仍被许多南亚侨民所广泛应用于日常生活当中。（另见印度更改地名之争）

Chennai /ˈtʃɛnnaɪ/ (formerly known as Madras /məˈdrɑːs/ or /-ˈdræs/) is the capital city of the Indian state of Tamil Nadu. Located on the Coromandel Coast off the Bay of Bengal, it is the biggest cultural, economic and educational centre in South India. Chennai is known as the "Detroit of South Asia" for its automobile industry. It is the fourth-largest city and fourth-most populous metropolitan area in the country and 36th-largest urban area in the world. Chennai is one of the most visited cities in India by foreign tourists, and 38th most visited city in the world. The Quality of Living Survey rated Chennai as the safest city in India. Chennai attracts about 45 percent of health tourists from abroad arriving in the country and 30 to 40 percent of domestic health tourists. As such, it is termed "India's health capital".