Leti, or Mangisa, is a Bantu language of Cameroon, spoken by the Mengisa people. Most Mengisa have switched to the Eton language, though a number of them continue to use Leti as a secret ritual language. A smaller number speak Leti as their mother tongue.
Leti is quite close to Tuki and may be a dialect. It is also closely related to Eton.
Mengisa is spoken in the northern part of Sa'a commune (in Lekié department, Central Region).