The 1989 Seattle Mariners season was their 13th since the franchise creation, and the team finished sixth in the American League West, with a record of .450. The Mariners were led by first-year manager Jim Lefebvre and the season was enlivened by the arrival of nineteen-year-old Ken Griffey Jr., the first overall pick of the 1987 draft.

Offseason

Regular season

Season standings

Record vs. opponents

Notable transactions

Major league debuts

Roster

Player stats

Batting

Starters by position

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

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

Farm system