The T77 submachine gun (T77衝鋒槍, T77 chōngfēngqiāng, literally means "T77 submachine gun") is a Taiwanese submachine gun.
The T77 was developed in 1985 to replace the aging MAC 10 in the Taiwanese Army, and as a development of the 9mm submachine gun. The T77 entered service in 1992 with the Republic of China Military Police Special Services Company.
The T77 is internally quite similar to the Uzi, firing from an open bolt with a telescoping bolt. The weapon's selector switch is located on the left hand side of the receiver, in the same place where a MAC 10 or MAC 11 selector switch would be; the weapon can fire in both semi-auto and full-auto. The weapon's sights are very similar to those on an Uzi.