Manggarai Regency is a regency in East Nusa Tenggara province of Indonesia, situated on the island of Flores. Established in 1958 the regency was reduced in size and population by the separation of the more western districts to form West Manggarai Regency in 2003 and of the more eastern districts to form East Manggarai Regency in 2007. The area of the residual Manggarai Regency is 1,343.83 km2 and its population was 292,037 at the 2010 census and 312,855 at the 2020 census; the official estimate as at mid 2023 was 328,758. The capital of the regency is the town of Ruteng.