London Colney is a village and civil parish in Hertfordshire, England. It is located to the north of London, close to Junction 22 of the M25 motorway.

It is near St Albans and part of the St Albans District. At the time of the 2001 census the population of London Colney ward was 7,742, increasing to 9,507 at the 2011 Census. It is considered a satellite or dormitory village of St Albans, where some villagers travel to work and shop.

Colney was first recorded in the 13th century. It takes its name from the River Colne, with the Old English suffix ea, meaning "river". The name London Colney, first recorded in 1555, referred to "Colney on the road to London", and distinguished the place from Colney Street.

The village was on the boundary of the 1860s London Coal Tax area; two posts still stand.

London Colney was historically part of the ancient parish of St Albans St Peter. In 1894 it became part of the civil parish of St Peter Rural, which was abolished in 1947 when London Colney became a separate civil parish.

London Colney Primary School was initially due to open on 4 September 1939. It was then closed on the same day, as war was declared. It opened properly a day later.

In the early morning of 12 May 1941, a German spy, Karel Richter, descended by parachute near London Colney. Richter buried his equipment and hid for a couple of days. Driven out by hunger (he had mistakenly buried his food parcel as well), Richter was approached by two lorry drivers who asked him the way to London. Suspicious of Richter's non-committal reply and foreignness, the lorry drivers then approached Constable Alec Scott and mentioned the strange man. Scott found Richter who asked to be taken to a hospital as he was feeling unwell. Scott called his superiors who quickly sent a car to pick up Richter and take him to jail.

Associated with the village there are walks, nature reserves and ponds. The Mosquito Aircraft Museum, now known as the de Havilland Aircraft Museum, established in 1959, is located at Salisbury Hall on the south side of the M25 motorway.