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.