The list of ship launches in 1684 includes a chronological list of some ships launched in 1684.
| Date | Country | Builder | Location | Ship | Class | Notes |
|---|---|---|---|---|---|---|
| 2 January | Venice | St. Nicholas | Ship of the line | For Venetian Navy. [1] | ||
| 15 March | Paolo di Ottavio Corso | Venice | Ercole Vittorioso | Fourth rate | For Venetian Navy. [2] | |
| 16 March | Iseppo di Piero de Pieri | Venice | San Marco Grande | Third rate | For Venetian Navy. [3] | |
| 1 April | Etienne Hubac | Brest | Vermandois | Third rate | For French Navy. [4] | |
| 23 October | Blaise Pangalo | Brest | Furieux | Third rate | For French Navy. [5] | |
| 17 November | Etienne Salicon | Le Havre | Gaillard | Fourth rate | For French Navy. [6] | |
| Unknown date | | Fredrikstad | Lossen | Frigate | For Dano-Norwegian Navy. | |
| Unknown date | Venice | Sant'Antonio da Padova | Sant'Antonio da Padova-class ship of the line | For Venetian Navy. [7] | ||
| Unknown date | Josias Pietersen | Vlissingen | Zeelandia | Second rate | For Dutch Republic Navy. [8] |