Seattle Mariners
2025 Seattle Mariners season
Logo Cap insignia
Established in 1977
Major league affiliations
American League (1977–present) West Division (1977–present)
Current uniform
Retired numbers	11 24 51 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 (4)	1995 1997 2001 2025
Wild card berths (2)	2000 2022
Front office
Principal owner	John Stanton
President	Kevin Martinez (President of Business Operations)
President of baseball operations	Jerry Dipoto
General manager	Justin Hollander[4]
Manager	Dan Wilson
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, originally 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 – before 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. Their mascot is the Mariner Moose.

The Mariners first fielded a winning team in 1991, and reached the playoffs in 1995, 1997, 2000, and 2001; the most successful period in franchise history. Led by Hall of Fame players Edgar Martínez, 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. Martínez'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 become an iconic moment in team history. They would win their second division title in 1997.

After Griffey, Johnson, and Alex Rodriguez 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, breaking the longest active drought in the four major North American sports. They won their fourth AL West division title in 2025, their first title since 2001.

The franchise has finished with a losing record in 30 of 49 seasons, as of 2025^[update]. The Mariners are the only active MLB franchise to never appear in the World Series, holding the sport's longest active World Series appearance drought.

As of the end of the 2025 season^[update], the Mariners' all-time win–loss record is 3,689–4,022–2 (.478).^[5]