The 2005 Arizona Diamondbacks season was the franchise's 8th season in Major League Baseball and their 8th season at Bank One Ballpark in Phoenix, Arizona, as members of the National League West. They looked to improve on their 51–111 record from 2004. They looked to contend in what was once again a weak National League West. They finished the season with a record of 77–85, good for second place in the division.

Offseason

Regular season

Notable Transactions

Season standings

National League West

Record vs. opponents

Roster

Player stats

Batting

Starters by position

''Note: Pos = Position; G = Games played; AB = At bats; H = Hits; Avg. = Batting average; HR = Home runs; RBI = Runs batted in''

Other batters

''Note: G = Games played; AB = At bats; H = Hits; Avg. = Batting average; HR = Home runs; RBI = Runs batted in''

Pitching

Starting pitchers

Note: G = Games pitched; IP = Innings pitched; W = Wins; L = Losses; ERA = Earned run average; SO = Strikeouts

Other pitchers

Note: G = Games pitched; IP = Innings pitched; W = Wins; L = Losses; ERA = Earned run average; SO = Strikeouts

Relief pitchers

Note: G = Games pitched; W = Wins; L = Losses; SV = Saves; ERA = Earned run average; SO = Strikeouts

Minor League

LEAGUE CHAMPIONS: South Bend