Ootacamund (Tamil: ஊடகாமுந்த்)  listen (help·info) (officially, Udhagamandalam Tamil: உதகமண்டலம் sometimes abbreviated to Udhagai Tamil: உதகை or Ooty  listen (help·info)), is a town, a municipality and the district capital of the Nilgiris district in the Indian state of Tamil Nadu. Ootacamund is a popular hill station located in the Nilgiri Hills. Originally occupied by the Todas, the area came under the rule of the East India Company at the end of the 18th century. Today the town's economy is based on tourism and agriculture, with manufacturing of medicines and photographic film also present. The town is connected to the rest of India by road and rail, and its historic sites and natural beauty attract tourists.

The origin of the name Udhagamandalam is obscure. The first mention of the place occurs in a letter of March 1821 to the Madras Gazette by an unknown correspondent as Wotokymund. In early times it was called OttaikalMandu "mund" is the Tamil word for a Toda village, and the first part is probably a corruption of the local name for the central region of the Nilgiri Plateau. Another likely origin of the stem of the name (Ootaca) comes from the local language where Otha-Cal literally means Single Stone. This is perhaps a reference to a sacred stone revered by the local Toda people. The name probably changed under British rule from Udhagamandalam to Ootacamund, later shortened to Ooty.