| Postseason: |
Won World Series (4-3) over Milwaukee Braves |

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Transactions listed are from November 1 of previous year to April 1 of the following year.
December 2, 1957
Harry Chiti drafted by the Kansas City Athletics in the 1957 rule 5 draft.
December 9, 1957
Released Jerry Coleman.
1958
Signed Rich Barry as an amateur free agent.
Signed Horace Clarke as an amateur free agent.
Signed Pedro Gonzalez as an amateur free agent.
Signed Don Lock as an amateur free agent.
Signed Pete Mikkelsen as an amateur free agent.
Signed Joe Pepitone as an amateur free agent.
Marshall Renfroe sent to the San Francisco Giants in an unknown transaction.
Moe Thacker sent to the Chicago Cubs in an unknown transaction.
Signed Tom Tresh as an amateur free agent.
Signed Dooley Womack as an amateur free agent.
March 20, 1958
Sold Joe Collins to the Philadelphia Phillies.
May 14, 1958 (Standings)
Sold Al Cicotte to the Washington Senators.
June 14, 1958 (Standings)
Sold Sal Maglie to the St. Louis Cardinals.
June 15, 1958 (Standings)
Traded Bob Grim and Harry Simpson to the Kansas City Athletics. Received Duke Maas and Virgil Trucks.
August 22, 1958 (Standings)
Traded Zeke Bella and cash to the Kansas City Athletics. Received Murry Dickson.
December 1, 1958
Jim Pisoni drafted by the Milwaukee Braves in the 1958 rule 5 draft.
December 2, 1958
Jay Ward selected by the Kansas City Athletics in the 1958 minor league draft.
1959
Signed Jim Bouton as an amateur free agent.
Returned Don Bradey to New Orleans (Southern Association) after expiration of minor league working agreement.
Signed Frank Carpin as an amateur free agent.
Signed Jack Cullen as an amateur free agent.
Signed Elvio Jimenez as an amateur free agent.
Signed Hal Stowe as an amateur free agent.