Lake Ptuj
Ptuj with Lake Ptuj in the background
Lake Ptuj
Location	Drava
Coordinates	46°24′7″N 15°53′36″E / 46.40194°N 15.89333°E / 46.40194; 15.89333
Basin countries	Slovenia
Max. length	5,500 m (18,000 ft)
Max. width	1,600 m (5,200 ft)
Surface area	3.5 km2 (1.4 sq mi)
Max. depth	12 m (39 ft)
Water volume	0.02 km3 (0.0048 cu mi)
Surface elevation	217.5 m (714 ft)
Islands	2
Settlements	Ptuj

Lake Ptuj (pronounced [ˈptuːi̯]; Slovene: Ptujsko jezero) is a reservoir on the Drava River southeast of the town of Ptuj in eastern Slovenia. It is the largest reservoir in Slovenia and was created in 1978 when a dam for the Formin hydroelectric power plant was built on the Drava. It is still used as the reservoir for the power plant, but is also popular for rowing, sailing, and fishing.

• Firbas, Peter: Vsa slovenska jezera : leksikon slovenskih stoječih voda. DZS, Ljubljana 2001 COBISS 110125568

• Media related to Lake Ptuj at Wikimedia Commons
• Lake Ptuj on Geopedia