Theydon Bois is a village and civil parish in the Epping Forest district of Essex, England. It is 1 mile south of Epping, 1 mile northeast of Loughton and 6 miles south of Harlow. The population was 4,062 as at the 2011 Census. Theydon Bois is inside the M25 motorway 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, Theydon Bois County Primary School. It lies on the edge of Epping Forest.