Tashi Namgyal Academy (a.k.a. T.N.A.) is a public school in the Himalayan state of Sikkim in India. It was founded in 1926 by the late Sir Tashi Namgyal, KCSI, KCIE, the 11th consecrated Ruler of Sikkim. It is an autonomous English-medium, co-educational and residential-cum-day school.

The school is affiliated with the Council for the Indian School Certificate Examinations, New Delhi and prepares students for the Indian Certificate of Secondary Education (Class X) and the Indian School Certificate (Class XII) Examinations.