South Mimms is a village in the civil parish of South Mimms and Ridge, in the borough of Hertsmere in Hertfordshire, England. The village is near the junction of the M25 motorway with the A1(M) motorway; it gives it name to the South Mimms services at that junction. At the 2021 census the built up area had a population of 661 and the civil parish of South Mimms had a population of 874. The civil parish subsequently merged with the neighbouring parish of Ridge in 2023 to form the new parish of South Mimms and Ridge.
