The Arizona Diamondbacks' 2015 season was the franchise's 18th season in Major League Baseball and their 18th season at Chase Field.
November 4: Signed Walter Ibarra to a minor league contract.
November 6: Signed Matt Pagnozzi to a minor league contract.
Week of November 13: Signed 3 players to a minor league contract and received Jeremy Hellickson from the Tampa Bay Rays for Andrew Velazquez and Justin Williams.
Week of November 20: Signed 8 players to a minor league contract, promoted 5 from the minors, sent 2 to the minors, and sent Charles Brewer and Mike Bolsinger to the Cleveland Indians and the Los Angeles Dodgers, respectively, for cash.
December 1: Signed J. C. Ramirez to a minor league contract.
December 5: Sent Didi Gregorius to the New York Yankees and received Domingo Leyba and Robbie Ray from the Detroit Tigers in a three-team deal.
December 8: Signed Yasmany Tomas and sent Zeke Spruill to the minors.
December 9: Received Jeferson Mejia and Zack Godley from the Chicago Cubs for Miguel Montero.
December 11: Drafted Oscar Hernández.
Week of December 12: Signed 4 players to a minor league contract and conducted the following trades:Sent Eury De La Rosa to the Oakland Athletics for cash.
Received Myles Smith, Rubby De La Rosa, Allen Webster, and Raymel Flores to the Boston Red Sox for Zeke Spruill and Wade Miley.
December 23: Signed Scott Kalamar to a minor league contract.
December 28: Signed Jordan Pacheco to a minor league contract.
Month of January 2015: Signed 8 players to a minor league contract.
February 2: Signed Gerald Laird to a minor league contract.
February 10: Signed 3 players to a minor league contract.
Through August 27, 2015
Note: G = Games played; AB = At bats; R = Runs scored; H = Hits; 2B = Doubles; 3B = Triples; HR = Home runs; RBI = Runs batted in; BB = Base on balls; SO = Strikeouts; AVG = Batting average; SB = Stolen bases
Note: W = Wins; L = Losses; ERA = Earned run average; G = Games pitched; GS = Games started; SV = Saves; IP = Innings pitched; H = Hits allowed; R = Runs allowed; ER = Earned runs allowed; HR = Home runs allowed; BB = Walks allowed; K = Strikeouts
LEAGUE CHAMPIONS: Hillsboro, Missoula