The 2005–06 National Division Two was the sixth version (nineteenth overall) of the third division of the English rugby union league system using the name National Division Two. New teams to the division included Henley Hawks and Orrell who were relegated from the 2004–05 National Division One, Halifax who were promoted from the 2004–05 National Division Three North as well as Barking (champions) and Redruth (runners up) who were promoted from the 2004–05 National Division Three South. Only one team would be relegated at the end of this season (instead of the usual three).