The 2004–05 National Division One was the 18th 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 Rotherham Titans who were demoted from the 2003-04 Zurich Premiership while Sedgley Park and Nottingham were promoted from the 2003–04 National Division Two. Rotherham almost went into liquidation and dropped out of the leagues following their relegation from the Premiership but were saved by a local consortium which enabled them to continue playing in National One. As well as new teams Coventry had a new ground, moving from Coundon Road to the smaller but more modern Butts Park Arena.