Theydon Bois ( or ) is a village and civil parish in the Epping Forest district of the county of Essex, England. It is located 1.4 miles (2.2 km) south of Epping, 0.85 miles (1.3 km) northeast of Loughton and 6 miles (9.6 km) south of Harlow. The population is 3,993, increasing to 4,062 at the 2011 Census. Theydon Bois is within the bounds of the M25 motorway and is situated near to its junction with the M11 motorway. It is served by Theydon Bois tube station on the Central line and has one primary school. It lies on the edge of Epping Forest.