The PT-76-57, also known as the PT-76E, is the most modern upgrade for the PT-76 platform. It introduces a more capable 57 mm autocannon, capable of firing the same shells as the ZSU-57-2, night vision devices, and an upgraded two-plane stabilizer. The new BM-57 turret houses the 57 mm AU-220M autocannon. With new armour-piercing shells capable of penetrating modern APCs and IFVs. The gun is also capable of engaging aerial targets in low-level flight from up to 6 kilometres. Mobility has been greatly increased with the addition of a new transmission, a more powerful engine with a power to weight ratio of 20 hp/ton, and new tracks that reduce driver fatigue. Survivability was also increased with modern fast-acting firefighting systems. The modernization also includes modern 1P67 and "Liga-S" optics for better target acquisition. A total of 50 units have been ordered.

Introduced during Update "Direct Hit" as a reward for Battle Pass: Season V, "River Hunter", the PT-76-57, possesses many significant upgrades, including night vision and a two-plane stabilizer. The main difference is the armament, a rapid-firing AU-220 57 mm cannon fitted in a unique turret which, using the same BR-281 shells as the ZSU-57-2, proves very effective when dealing with numerous enemies at once. Compared to the ZSU-57-2 due to the similar armament, the PT-76-57 makes up having only half the firepower by instead having a significantly faster rate of fire. On a relatively mobile and low-profile chassis, the PT-76-57 can be a true menace on the battlefield when flanking otherwise heavily armoured foes or tearing through lightly armoured IFVs and light tanks. Its gun is capable of destroying targets with its APHE shell even from the front when it faces lower BR opponents. The laser rangefinder makes it very easy to acquire targets at longer distances, and allow the PT-76-57 to be used as a flanker/sniper.