The 2008–09 National Division One was the 22nd full season of rugby union within the second tier of the English league system, currently known as the RFU Championship.

Leeds Carnegie joined National Division One, having been relegated from the Guinness Premiership after the 2007–08 season.

[2] Leeds Carnegie won a quick promotion back to the Guinness Premiership, while five teams were relegated to the newly named 2009–10 National League 1: Esher, Sedgley Park, Newbury, Otley and Manchester.

[3][4] The reason for the large number of teams being relegated was due to the league being restructured the next season from 16 to 12 teams as the new RFU Championship was introduced.

[5] [8] [9] [10] 95 - 5 Nottingham at home to Otley on 8 March 2009 104 - 0 Leeds Carnegie away to Manchester on 8 April 2009 104 - 0 Leeds Carnegie away to Manchester on 8 April 2009 Leeds Carnegie away to Manchester on 8 April 2009 Nottingham at home to Otley on 8 March 2009 Leeds Carnegie away to Manchester on 8 April 2009 Rotherham Titans at home to Exeter Chiefs on 11 April 2009 Cornish Pirates at home to Plymouth Albion on 12 April 2009 [11][12][13][14] Tim Taylor for Nottingham at home to Otley on 8 March 2009 Tom Brown for London Welsh at home to Manchester on 28 March 2009 Jason Strange for Leeds Carnegie away to Manchester on 8 April 2009 Michael Whitehead for Rotherham Titans at home to Exeter Chiefs on 11 April 2009 Rhys Jones for Cornish Pirates at home to Plymouth Albion on 12 April 2009 [15][16][17][18][19] Exeter Chiefs at home to Cornish Pirates on 27 December 2008 Manchester at home to Esher on 31 January 2009 Exeter Chiefs Manchester [20]