There have been 21 managers in the history of the Seattle Mariners Major League Baseball (MLB) franchise. The Mariners franchise was formed in 1977 as a member of the American League. Darrell Johnson was hired as the first Mariners manager, serving for just over three seasons before being replaced during the 1980 season. In terms of tenure, Lou Piniella has managed more games and seasons than any other coach in their franchise history. He managed the Mariners to four playoff berths (1995, 1997, 2000 and 2001), led the team to the American League Championship Series in 1995, 2000 and 2001, and won the Manager of the Year award in 1995 and 2001. Until 2022, Piniella was the only manager in Mariners history to lead a team into the playoffs, with one of those times after a 116-win season, tying the record for most wins in a season. None of the previous managers had made it to the playoffs before. Piniella, however, managed the team in 34 playoff games, winning 15 and losing 19. Dick Williams is the only Mariners manager to have been inducted into the Baseball Hall of Fame.

There have been nine interim managers in Mariners history. In 1980, manager Darrell Johnson was replaced by Maury Wills. In 1981, manager Rene Lachemann replaced Maury Wills. In 1983, Lachemann was relieved by Del Crandall. Crandall did not last a full season either, as Chuck Cottier took over his job in 1984. By 1986, Cottier was replaced with a temporary manager, Marty Martinez. After one game, the Mariners found Dick Williams to take over the role of manager. He in turn was replaced by Jim Snyder in 1988. In 2007, manager Mike Hargrove resigned in a surprise move amidst a winning streak, citing increased difficulty in putting forth the same effort he demanded of his players. Hargrove was replaced with bench coach John McLaren midseason. A year later, in 2008, the Mariners front office decided McLaren was not performing by their standards, and was fired and replaced by interim manager Jim Riggleman. New general manager Jack Zduriencik hired Don Wakamatsu as skipper for the 2009 season; after finishing the season with a .525 winning percentage, the team's poor performance coupled with off-field issues led to Wakamatsu's firing on August 9, 2010."Mariners cut ties with skipper Don Wakamatsu" . NBC Sports. Retrieved on 2010-08-09 Daren Brown, who was the manager of the Mariners' Triple-A affiliate, the Tacoma Rainiers, managed the Mariners for the remainder of the 2010 season. Eric Wedge was hired to manage the team for the 2011 to 2013 seasons. Lloyd McClendon was hired as the Mariners' manager on November 7, 2013, till the end of the 2015 season. Scott Servais was hired on October 23, 2015, and lead the team to their first playoff appearance since 2001 in 2022 while also becoming the second longest tenured manager in team history from 2016 to 2024. The Mariners then fired Servais after a midseason collapse on August 22, 2024, and immediately hired Dan Wilson as their next manager on the same day.

Key #Number of coachesGCGames coachedWWinsLLossesWin%Winning percentagePGMPlayoff games managedPWPlayoff winsPLPlayoff losses*Elected to the Baseball Hall of Fame

Statistics are accurate through 2026 season.

Managers # Image Manager Seasons G W L Win% PGM PW PL Awards Ref1Darrell Johnson1977–1980588226362.384 – – – 2Maury Wills1980–1981822656.317 – – – 3Rene Lachemann1981–1983320140180.438 – – – 4Del Crandall1983–198422493131.415 – – – 5Chuck Cottier1984–198621798119.452 – – – 6Marty Martínez1986101.000 – – – 7Dick Williams*1986–1988351159192.453 – – – 8Jim Snyder19881054560.429 – – – 9Jim Lefebvre1989–1991486233253.479 – – – 10Bill Plummer19921626498.395 – – – 11Lou Piniella1993–20021,551840711.542341519Manager of the Year Award (1995, 2001)12Bob Melvin2003–2004324156168.481 – – – 13Mike Hargrove2005–2007402192210.478 – – – 14John McLaren2007–20081566888.436 – – – 15Jim Riggleman2008903654.400 – – – 16Don Wakamatsu2009–2010274127147.464 – – – 17Daren Brown2010501931.380 – – – 18Eric Wedge2011–2013486213273.440 – – – 19Lloyd McClendon2014–2015324163161 – – – 20Scott Servais2016–20241,292668 62452321Dan Wilson 2024–2026 358 187 171 1266

Notes A running total of the number of managers of the Mariners. Thus any manager who has had two or more terms as manager is only counted once.

References