David John Hume Walder (born 7 May 1978 in Newcastle) is a rugby union footballer who plays at fly-half for Mitsubishi Dynaboars in Japan, having signed for them from London Wasps at the end of the 2010-2011 season. He joined London Wasps from Newcastle Falcons in the summer of 2006, and he played a large part in his team's first win, against the Saracens. Walder signed a one-year deal to play for Air New Zealand Cup side North Harbour, but was unable to go through with the move due to injury.
Whilst at Newcastle he played in the final of the 2001 Tetley's Bitter Cup, scoring the winning try against Harlequins. He also started in the 2004 final, scoring 17 points (four conversions and three penalties) as Newcastle defeated the Sale Sharks.
He earned his most recent England cap against Wales in a World Cup warm up match in Cardiff in August 2003. However, he missed selection for the World Cup and he stayed at home.