Lolei  is the northernmost temple of the Roluos group of three late 9th century Hindu temples at Angkor, Cambodia, the others members of which are Preah Ko and the Bakong. Lolei was the last of the three temples to be built as part of the city of Hariharalaya that once flourished at Roluos, and in 893 the Khmer king Yasovarman I dedicated it to Shiva and to members of the royal family. The name "Lolei" is thought to be a modern corruption of the ancient name "Hariharalaya," which means "the city of Harihara." Once an island temple, Lolei was located on an island slightly north of centre in the now dry Indratataka baray, construction of which had nearly been completed under Yasovarman's father and predecessor Indravarman I. Scholars believe that placing the temple on an island in the middle of a body of water served to identify it symbolically with Mount Meru, home of the gods, which in Hindu mythology is surrounded by the world oceans

Lolei is part of the Roluos group and was an island temple consisting of four brick towers on a double laterite platform, when it was built it was located in the center of the first large-scalereservoir (baray) constructed by a Khmer king (now dried up). Lolei was the last major temple built at Roluos before Yasovarman I moved the capital to the Angkor area. Though the towers are in poor condition there are some good lintel carvings, as well as some beautifully artistic calligraphy inscriptions to be admired on all the door jambs. An active modern-day pagoda has been built amongst the ruins.