1958 Kansas City Athletics season

The 1958 Kansas City Athletics season was the team's fourth in Kansas City and the 58th in the American League. The season involved the A's finishing seventh in the American League with a record of 73 wins and 81 losses, 19 games behind the World Champion New York Yankees.

Offseason

 * November 20, 1957: Billy Martin, Mickey McDermott, Tom Morgan, Lou Skizas, Tim Thompson, and Gus Zernial were traded by the Athletics to the Detroit Tigers for Bill Tuttle, Jim Small, Duke Maas, John Tsitouris, Frank House, and Kent Hadley, and a player to be named later. The Tigers completed the deal by sending Jim McManus to the Athletics on April 3, 1958.
 * December 2, 1957: Harry Chiti was drafted by the Athletics from the New York Yankees in the 1957 rule 5 draft.
 * December 2, 1957: Ramón Conde was drafted by the Athletics from the San Francisco Giants in the 1957 minor league draft.

Notable transactions

 * April 15, 1958: Ramón Conde was acquired from the Athletics by the Philadelphia Phillies.
 * May 14, 1958: Whitey Herzog was purchased by the Athletics from the Washington Senators.
 * June 12, 1958: Billy Hunter was traded by the Athletics to the Cleveland Indians for Chico Carrasquel.
 * June 15, 1958: Woodie Held and Vic Power were traded by the Athletics to the Cleveland Indians for Roger Maris, Dick Tomanek and Preston Ward.

Starters by position
''Note: Pos = Position; G = Games played; AB = At bats; H = Hits; Avg. = Batting average; HR = Home runs; RBI = Runs batted in''

Other batters
''Note: G = Games played; AB = At bats; H = Hits; Avg. = Batting average; HR = Home runs; RBI = Runs batted in''

Starting pitchers
Note: G = Games pitched; IP = Innings pitched; W = Wins; L = Losses; ERA = Earned run average; SO = Strikeouts

Other pitchers
Note: G = Games pitched; IP = Innings pitched; W = Wins; L = Losses; ERA = Earned run average; SO = Strikeouts

Relief pitchers
Note: G = Games pitched; W = Wins; L = Losses; SV = Saves; ERA = Earned run average; SO = Strikeouts

Farm system
Rochester franchise moved to Winona, June 29, 1958