Lake Bled (Slovene: Blejsko jezero; German: Bleder See, Veldeser See) is a lake in the Julian Alps of the Upper Carniolan region of northwestern Slovenia, where it adjoins the town of Bled. The area is a tourist destination. The lake is 35 km (22 mi) from Ljubljana International Airport and 55 km (34 mi) from the capital city, Ljubljana. Lake Bled is 4.2 km (2.6 mi) from Lesce-Bled train station.

It is 2,120 m (6,960 ft) long and 1,380 m (4,530 ft) wide, with a maximum depth of 29.5 m (97 ft), and it has a small island. The lake lies in a picturesque environment, surrounded by mountains and forests. Medieval Bled Castle stands above the lake on the north shore and has a museum.The Zaka Valley lies at the west end of the lake.

For centuries, Europeans have flocked to the shores of Lake Bled to enjoy recreation, but also the medicinal benefits. Emperor Henry II, ruler of the Holy Roman Empire enjoyed the lake so much, that he also built Bled Castle in 1004 to confer it as estate.

Today the castle is a popular tourist attraction on Bled Island (Blejski otok). The island has several buildings, the main one being the pilgrimage church dedicated to the Assumption of Mary (Cerkev Marijinega vnebovzetja), built in its current form near the end of the 17th century, and decorated with remains of Gothic frescos from around 1470 in the presbyterium and rich Baroque equipment.

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