The list of ship commissionings in 1939 includes a chronological list of ships commissioned in 1939. 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 | Ref | |
|---|---|---|---|---|---|---|
| 2 February | ||||||
| 4 February | ||||||
| 4 February | ||||||
| 11 February | ||||||
| 4 March | ||||||
| 16 April | ||||||
| 22 April | ||||||
| 22 April | ||||||
| 29 April | ||||||
| 30 April | submarine | ex-Batiray seized from the Turkish Navy during construction | ||||
| 24 June | ||||||
| 3 July | ||||||
| 15 July | ||||||
| 22 July | ||||||
| 1 August | ||||||
| 12 August | ||||||
| 26 August | ||||||
| 28 August | ||||||
| 5 August | light seaplane carrier | |||||
| 20 September | ||||||
| 23 September | ||||||
| 30 September | recommissioned to establish the Neutrality Patrol | [1] | ||||
| September (unknown date) | Vorpostenboot | converted fishing trawler | ||||
| 2 October | hospital ship | converted ferry, ex-Dinard of the Southern Railway Co | ||||
| 12 October | seaplane tender | converted merchant ship | ||||
| 4 November | ||||||
| 4 December | recommissioned from reserve at Philadelphia Navy Yard for Neutrality Patrol | [2] | ||||
| 12 December | ||||||
| 16 December | ||||||
| 21 December | ||||||
| unknown date | seaplane tender | civilian type |