The list of ship commissionings in 1919 includes a chronological list of ships commissioned in 1919. 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 | |
|---|---|---|---|---|---|---|
| 24 January | ||||||
| 15 February | ||||||
| 20 February | ||||||
| 25 February | ||||||
| 1 March | ||||||
| 8 March | ||||||
| 24 March | ||||||
| 18 April | ||||||
| 21 April | under command of Cmdr. Raymond A. Spruance | [1] | ||||
| 15 May | ||||||
| 26 May | ||||||
| 26 June | ||||||
| 19 July | under command of Lieutenant Commander William N. Richardson Jr. | [2] | ||||
| 13 October | oiler | |||||
| 15 November | oiler | |||||
| unknown date | United States Coast and Geodetic Survey | Audwin | survey vessel | former section patrol vessel | ||
| unknown date | United States Bureau of Fisheries | cargo ship | former fishing vessel Idaho commissioned in the summer of 1919 as a cargo liner |