Theydon Bois is a London Underground station in the Epping Forest district of Essex. It is served by the Central Line and is between Debden and Epping. For the purposes of fare charging it is in Zone 6. Theydon Bois station is the least used station in Zone 6, and is also the least used station on the Epping Branch, which covers stations from Snaresbrook - Epping.