Charles G. Armstrong is an American attorney and former officer of the United States Navy, best known for his 28-year tenure as president of the Seattle Mariners Major League Baseball club, a position from which he stepped down on January 31, 2014.

[2] Armstrong was employed as general counsel for George Argyros' California real estate business when the latter purchased the Mariners from the team's original ownership group, led by entertainer Danny Kaye, in 1981.

[3] During 1987 and 1988, Argyros was attempting to purchase the San Diego Padres and sell the Mariners to several possible out-of-state investors, one of whom intended to move the team to Miami.

Armstrong attempted to organize a group of Seattle-based investors with the intention of keeping the team in Seattle; however, citing a conflict of interest, Argyros instructed him to "back away" from his efforts.

[3] He served as a consultant to Seattle-area business leader John Ellis while The Baseball Club of Seattle (led by Nintendo chairman Hiroshi Yamauchi) was negotiating to purchase the team.