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.

Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.

Source: Matches
Ground: A = Away; H = Home. Result: D = Draw; L = Loss; W = Win; P = Postponed.

Source: the-AFC.com
Rules for classification: 1) points; 2) goal difference; 3) number of goals scored.
¹First place through to sixth place qualify for the 2010 A-League Finals Series.
²First place qualifies for the 2011 AFC Champions League Group stage.
³Winning the 2010 A-League Grand Final automatically earns qualification for the 2011 AFC Champions League Group stage, unless first place are champions.
⁴Second place qualifies for the 2011 AFC Champions League Qualifying play-off, unless they qualify for the 2010 A-League Grand Final alongside first place or become A-League Champions, subsequently third place then qualify for the 2011 AFC Champions League Qualifying play-off.

Player Started Player Subbed In Player Suspended Player Injured/sick Player on International Duty Player Left Club/Not Signed/Loan Expired