The 2009 WNBA season was the 13th season for the Phoenix Mercury of the Women's National Basketball Association (WNBA). The Mercury won the WNBA Finals for the second time in franchise history. On June 6, the Mercury and LifeLock entered a multi-year marketing partnership to launch the first-ever branded jersey in WNBA or NBA history. A press conference was held at the NBA Store in New York City with Phoenix Mercury President and COO Jay Parry and LifeLock CEO Todd Davis to make the announcement. The partnership ran through 2011, and the LifeLock name was on the front of Phoenix Mercury’s player jerseys and on warm-up suits. The Mercury and LifeLock ware the first to finalize such an agreement following the WNBA’s decision this off-season to make this opportunity available for its teams and sponsors. As part of the partnership, LifeLock offered a one-year complimentary membership to season ticket holders of all WNBA teams.

Off-season

Dispersal draft

Based on the Mercury's 2008 record, they picked 5th in the Houston Comets dispersal draft. The Mercury picked Sequoia Holmes.

WNBA draft

The following are the Mercury's selections in the 2009 WNBA draft:

Transactions

Free agents

Additions

Subtractions

Roster

Season standings

Schedule

Preseason

Regular season

Postseason

Regular season statistics

Player statistics

Team statistics

Awards and honors