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