1983 Seattle Mariners season

The 1983 Major League Baseball season was the seventh season in the history of the Seattle Mariners. They were seventh in the American League West at .370, 39 games behind, with the worst record in the major leagues. They became the first team to fail to sweep an opponent in any series.

In his third season as the Mariners' manager, Rene Lachemann was fired on June 25, succeeded by Del Crandall. At the time, the Mariners were .350, on an eight-game losing streak, and had the worst record in the majors. A former major league manager, Crandall was managing the Triple-A Albuquerque Dukes, the Pacific Coast League affiliate of the Los Angeles Dodgers.

Offseason

 * December 9, 1982: Rich Bordi was traded to the Chicago Cubs for Steve Henderson.
 * January 20, 1983: Danny Tartabull was chosen from the Cincinnati Reds as a free agent compensation pick.
 * January 27, 1983: Vance McHenry was traded to the Texas Rangers for Bob Babcock.
 * January 28, 1983: Mike Hart was released.
 * March 28, 1983: Bobby Brown was released.
 * March 31, 1983: Ken Phelps was purchased from the Montreal Expos.

Notable transactions

 * April 4 – Clint Hurdle was released.
 * May 31 – Bob Long was signed as a free agent.
 * June 27 – Gaylord Perry was released.
 * June 30 – Todd Cruz was purchased by the Baltimore Orioles.

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''

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