The 2002–03 National Division One (for sponsorship reasons known as the Jewson National Division One) was the 16th full season of rugby union within the second tier of the English league system, currently known as the RFU Championship. New teams to the division included Orrell and Plymouth Albion who were promoted from 2001–02 National Division Two while no team was relegated from the 2001-02 Zurich Premiership as Rotherham's ground was not deemed suitable for top flight games.