Lake Plav (Montenegrin: Плавско језеро, romanized: Plavsko jezero; Albanian: Liqeni i Plavës) is a lake in Plav municipality, in northeastern Montenegro.

It is a glacial lake located between the Accursed Mountains and Visitor mountain ranges at an altitude of 906 metres (2,972 ft) above sea level, and extends north–south for some 2,160 metres (7,090 ft). Its average width is 920 metres (3,020 ft), and its maximum depth is 9 meters (30 ft).

It is the largest glacial lake in Montenegro, and is also the best-known tourist attraction in the area.

The whole Plav region nestles at the foot of the towering Accursed Mountains range and rests on the banks of Lake Plav. The lake itself stretches from north to south for nearly a mile.

The lake itself is full of limestone caverns and there are many springs where water gushes forth from the earth.

• Lake Plav and Ali-Pashas Springs