Over the seasons, the Athletics' uniforms have paid homage to their amateur forebears. Until 1954, when the uniforms had "Athletics" spelled out in script across the front, the team's name never appeared on either home or road uniforms. Furthermore, neither "Philadelphia" nor the letter "P" appeared on the uniform or cap. The Philadelphia uniform had only a script "A" on the left front, and likewise the cap usually had the same "A" on it. In the early days of the American League, the standings listed the club as "Athletic" rather than "Philadelphia", in keeping with the old tradition. Eventually, the city name came to be used for the team, as with the other major league clubs. After buying the team in 1960, owner
Charles O. Finley introduced road uniforms with "Kansas City" printed on them, with an interlocking "KC" on the cap. Upon moving to Oakland, the "A" cap emblem was restored, and in 1970 an "apostrophe-s" was added to the cap and uniform emblem to reflect that Finley was officially changing the team's name to the "A's". While in Kansas City, Finley changed the team's colors from their traditional red, white and blue to kelly green and gold. It was here that he began experimenting with dramatic uniforms to match these bright colors, such as gold sleeveless tops with green undershirts and gold pants. The uniform innovations increased after the team's move to Oakland, which came with the introduction of polyester pullover uniforms. During their dynasty years in the 1970s, the A's had dozens of uniform combinations with jerseys and pants in all three team colors, and never wore the traditional gray on the road, instead wearing green or gold, which helped to contribute to their nickname of "The Swingin' A's". After the team's sale to the
Haas family, the team changed its primary color to a more subdued forest green in 1982 and began a move back to more traditional uniforms. The 2023 team wore home uniforms with "Athletics" spelled out in script writing and road uniforms with "Oakland" spelled out in script writing, with the cap logo consisting of the traditional "A" with "apostrophe-s". The home cap, which was also the team's road cap until 1992, is forest green with a gold bill and white lettering. This design was also the basis of their batting helmet, which is used both at home and on the road. The road cap, which initially debuted in 1993, is all-forest green. The first version had the white "A's" wordmark before it was changed to gold the following season. An all-forest green batting helmet was paired with this cap until 2008. In 2014, the "A's" wordmark returned to white but added gold trim. From 1994 until 2013, the A's wore green
alternate jerseys with the word "Athletics" in gold, for both road and home games. During the 2000s, the Athletics introduced black as one of their colors. They began wearing a black alternate jersey with "Athletics" written in green. After a brief discontinuance, the A's brought back the black jersey, this time with "Athletics" written in white with gold highlights. The cap paired with this jersey is all-black, initially with the green and white-trimmed "A's" wordmark, before switching to a white and gold-trimmed "A's" wordmark. Commercially popular but rarely chosen as the alternate by players, the black uniform was retired in 2011 in favor of a gold alternate jersey. The gold alternate has "A's" in green trimmed in white on the left chest. With the exception of several road games during the 2011 season, the Athletics' gold uniforms were used as the designated home alternates. A green version of their gold alternates was introduced for the 2014 season, serving as a replacement to the previous green alternates. The new green alternates featured the piping, "A's" and lettering in white with gold trim. In 2018, as part of the franchise's 50th anniversary since the move to Oakland, the A's wore a kelly green alternate uniform with "Oakland" in white with gold trim, and was paired with an all-kelly green cap. This set was later worn with an alternate kelly green helmet with gold visor. This uniform eventually supplanted the gold alternates by 2019, and in 2022, after the forest green alternate was retired, it became the team's only active alternate uniform. The nickname "A's" has long been used interchangeably with "Athletics", dating to the team's early days when headline writers used it to shorten the name. From 1972 through 1980, the team name was officially "Oakland A's", although the
Commissioner's Trophy, given out annually to the winner of baseball's
World Series, still listed the team's name as the "Oakland Athletics" on the gold-plated pennant representing the Oakland franchise. According to Bill Libby's Book, ''Charlie O and the Angry A's'', owner Charlie O. Finley banned the word "Athletics" from the club's name because he felt that name was too closely associated with former Philadelphia Athletics owner Connie Mack, and he wanted the name "Oakland A's" to become just as closely associated with him. The name also vaguely suggested the name of the old minor league
Oakland Oaks, which were alternatively called the "Acorns". New owner Walter Haas restored the official name to "Athletics" in 1981, but retained the nickname "A's" for marketing. At first, the word "Athletics" was restored only to the club's logo, underneath the much larger stylized-"A" that had come to represent the team since the early days. By 1987, however, the word returned, in script lettering, to the front of the team's jerseys. After the team's departure from Oakland, the existing uniform set was mostly retained aside from the wordmark on the road uniform being changed from "Oakland" to "Athletics". The gold alternate uniform also returned after it was last worn in 2018. From 2025 to 2027, while the team temporarily plays its home games in West Sacramento, all of its uniforms feature the "Athletics" wordmark, with no mention of a home city. However, all uniforms feature a green logo patch on one sleeve depicting one of the towers of the Sacramento
Tower Bridge and "Sacramento" written under it in yellow text to commemorate the team's temporary home. The Athletics updated their gold alternate uniform with a script "Sacramento" on the chest, which they would wear starting in 2026. They plan to wear the uniform every Friday home game, with the option to wear them on other days as well. Prior to the mid-2010s, the A's had a long-standing tradition of wearing white cleats team-wide (in line with the standard MLB practice that required all uniformed team members to wear a base cleat color), which dated to the Finley ownership. Since the mid-2010s, however, MLB has gradually relaxed its shoe color rules, and several A's players began wearing cleats in non-white colors, such as
Jed Lowrie's green cleats. ==Planned relocation to Las Vegas==