The Arizona Diamondbacks' 2009 season was the franchise's 12th season in Major League Baseball.

Regular season

Season standings

Record vs. opponents

Game log

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Roster

Player stats

Note: Team batting and pitching leaders in each category are in bold.

Batting

Note: G = Games played; AB = At bats; R = Runs scored; H = Hits; 2B = Doubles; 3B = Triples; HR = Home runs; RBI = Runs batted in; AVG = Batting average; SB = Stolen bases

Pitching

Note: W = Wins; L = Losses; ERA = Earned run average; G = Games pitched; GS = Games started; SV = Saves; IP = Innings pitched; R = Runs allowed; ER = Earned runs allowed; BB = Walks allowed; K = Strikeouts

Farm system