Lørenskog is a municipality in Akershus county, Norway. It is part of the traditional region of Romerike. The administrative centre of the municipality is the village of Lørenskog. Lørenskog was separated from the municipality of Skedsmo on 1 January 1908.

The municipality (originally the parish) is named after the old (and no longer existent) Leirheimr farm. The first element is leirr which means "clay" and the last element is heimr which means "homestead" or "farm". Thus: "the farm built on clay ground". The suffix skógr (meaning "wood") was added later, changing the meaning to "the woodlands around the farm Leirheimr". Prior to 1918, the name was spelled "Lørenskogen".

Lørenskog's arms date from modern times. Granted on 26 July 1957, they show a red waterwheel on a gold background. Water-driven sawmills were once an important part of the municipality's economy.

Lørenskog Church (Lørenskog kirke) is a medieval era church. The building material was brick and quarried limestone. The church dates to ca. 1150. The church is of rectangular plan and has 140 seats. In 1608 the church received a pulpit. The west tower was made of wood and was erected in 1864. In the tower hangs two church bells, the larger made in 1874. Its walls are one meter thick, and the stones are held together with lime mortar. The exterior and interior plaster was repaired during the 1600s and 1700s. In 1956 old plaster was removed and walls re-plastered and painted. The current outward opening door was inserted in 1946.

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