Seattle Mariners
2024 Seattle Mariners season
Established in 1977
Team logo Cap insignia
Major league affiliations
American League (1977–present) West Division (1977–present)
Current uniform
Retired numbers	11 24 42
Colors
Navy blue, metallic silver, Northwest green, royal blue, yellow, cream[1][2][3]
Name
Seattle Mariners (1977–present)
Other nicknames
The M's
Ballpark
T-Mobile Park (1999–present) Kingdome (1977–1999)
Major league titles
World Series titles (0)	None
AL Pennants (0)	None
West Division titles (3)	1995 1997 2001
Wild card berths (2)	2000 2022
Front office
Principal owner(s)	John Stanton
President of baseball operations	Jerry Dipoto
General manager	Justin Hollander[4]
Manager	Scott Servais
Website	mlb.com/mariners

The Seattle Mariners are an American professional baseball team based in Seattle. The Mariners compete in Major League Baseball (MLB) as a member club of the American League (AL) West Division. The team joined the American League as an expansion team in 1977 playing their home games in the Kingdome. Since July 1999, the Mariners' home ballpark has been T-Mobile Park, located in the SoDo neighborhood of Seattle.

The "Mariners" name originates from the prominence of marine culture in the city of Seattle. They are nicknamed the M's, a title featured in their primary logo from 1987 to 1992. They adopted their current team colors – navy blue, northwest green (teal), and silver – prior to the 1993 season, after having been royal blue and gold since the team's inception; the original colors continue to be used in alternate uniforms.^[3] Their mascot is the Mariner Moose.

The franchise did not field a winning team until 1991 and further success eluded them until the late-90s, which saw the most successful period in franchise history. Led by Hall of Fame players Edgar Martinez, Ken Griffey Jr., and Randy Johnson, the Mariners clinched their first playoff berth in 1995 when they won their first division championship and defeated the New York Yankees in the ALDS. Martinez's walk-off double in Game 5 drove Griffey in from first base to win the game in the 11th inning, clinched a series win for the Mariners, served as a powerful impetus to preserve baseball in Seattle, and has since become an iconic moment in team history. They would later win their second division title in 1997.

After Griffey, Johnson, and Alex Rodriguez all left the team, the Mariners, bolstered by the signing of Ichiro Suzuki, won 116 games in 2001, which set the American League record for most wins in a single season and tied the 1906 Chicago Cubs for the Major League record for most wins in a single season. The team would not make the postseason again until 2022, which was the longest active drought in the four major North American sports.^[5][6]

As of 2023, the franchise has finished with a losing record in 30 of 47 seasons. The Mariners are the only active MLB franchise never to have appeared in the World Series, and currently hold the longest active World Series appearance drought in MLB.

As of 2023^[update], the Mariners' all-time win–loss record is 3,514–3,873–2 (.482).^[7]