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The list of ship commissionings in 1955 includes a chronological list of ships commissioned in 1955. In cases where no official commissioning ceremony was held, the date of service entry may be used instead.
| Date | Operator | Ship | Class and type | Notes |
|---|---|---|---|---|
| January 24 |  Royal Danish Navy
|
Aarøsund (M571) | Adjutant-class minesweeper | Ex-AMS-127, also maintained on the United States Navy Register until 1981 [1][2] |
| February 1 |  United States Navy
|
Shangri-La (CVA-38) | Essex-class aircraft carrier | Recommissioned from reserve |
| February 17 | United States Navy
|
Lexington (CVA-16) | Essex-class aircraft carrier | Recommissioned from reserve |
| October 1 | United States Navy
|
Forrestal (CVA-59) | Forrestal-class aircraft carrier | |
| October 28 |  Royal Australian Navy
|
Melbourne (R21) | Majestic-class aircraft carrier | Ex-HMS Majestic |