2001–02 National Division Three South

The 2001–02 National Division Three South was the second season (fifteenth overall) of the fourth division (south) of the English domestic rugby union competition using the name National Division Three South. New teams to the division included Lydney and who were relegated from the 2000–01 National Division Two while promoted teams included Old Colfeians and Old Patesians, champions of London Division 1 and South West Division 1 respectively. The league system was 2 points for a win and 1 point for a draw with the league champions going straight up into National Division Two and the runners up playing a playoff against the runners up from National Division Three North for the final promotion place.

2001–02 National Division Three South

The 2001–02 National Division Three South was the second season (fifteenth overall) of the fourth division (south) of the English domestic rugby union competition using the name National Division Three South. New teams to the division included Lydney and who were relegated from the 2000–01 National Division Two while promoted teams included Old Colfeians and Old Patesians, champions of London Division 1 and South West Division 1 respectively. The league system was 2 points for a win and 1 point for a draw with the league champions going straight up into National Division Two and the runners up playing a playoff against the runners up from National Division Three North for the final promotion place.