The 2009–10 season is the Wellington Phoenix's third season of football in the Hyundai A-League, making it the longest running New Zealand team in the competition, surpassing the defunct New Zealand Knights.

Wellington Phoenix Football Club is a professional football club based in Wellington, New Zealand. It competes in the Australian A-League, under licence from Football Federation Australia. Phoenix entered the competition in the 2007–08 season after its formation in March 2007, by New Zealand Football to replace New Zealand Knights as a New Zealand-based club in the Australian A-League competition. Since 2011, the club has been owned by Welnix, a consortium of seven Wellington businessmen.