The list of ship commissionings in 1942 includes a chronological list of ships commissioned in 1942. 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 | |
|---|---|---|---|---|---|
| March 2 | ex-Rio Hudson | ||||
| March 2 | ex-Rio Parana | ||||
| March 3 | ex-Rio de la Plata | ||||
| March 4 | under command of Commander Orville F. Gregor [1] | ||||
| March 20 | |||||
| March | Wreck dispersal vessel | ex- | |||
| April 30 | |||||
| May 1 | Completion date | ||||
| May 12 | Patrol yacht | ex-Ramfis[2] | |||
| May 12 | |||||
| June 3 | Landing Ship, Infantry | ex- for Southern Railway, requisitioned on completion | |||
| June 15 | ex-Steel Architect | ||||
| June 22 | |||||
| July 1 | ex-Rio de Janeiro | ||||
| August 9 | sloop | SG 1 | |||
| August 16 | |||||
| August 20 | |||||
| August 21 | recommissioned after conversion | ||||
| August 25 | recommissioned after conversion | ||||
| August 29 | |||||
| August 31 | |||||
| September 7 | sloop | SG 2 | |||
| September 15 | |||||
| September 19 | recommissioned after conversion | ||||
| September 24 | recommissioned after conversion | ||||
| September 26 | ex-Steel Advocate | ||||
| September 30 | ex-, acquired through Lend-Lease | ||||
| November 2 | sloop | SG 3 | |||
| November 8 | |||||
| November 15 | ex-, acquired through Lend-Lease | ||||
| November 22 | completion date | ||||
| December 21 | ex-, acquired through Lend-Lease | ||||
| December 10 | |||||
| December 31 | |||||
| December | completion date | ||||
| unknown date | Weather ship | WBS 6 |