List of ship launches in 1721

The list of ship launches in 1721 includes a chronological list of some ships launched in 1721.

Date	Ship	Class	Builder	Location	Country	Notes
1 April	Éclatant	Eclatant-class ship of the line	Blaise Geslain	Brest	Kingdom of France	For French Navy.[1]
18 April	Bonetta	Sloop of War	Richard Stacey	Deptford Dockyard	Great Britain	For Royal Navy.[2]
6 May	Ferret	Sloop of War	John Hayward	Woolwich Dockyard	Great Britain	For Royal Navy.[3]
8 August	Otter	Sloop of War	Richard Stacey	Deptford Dockyard	Great Britain	For Royal Navy.[4]
19 August	Swift	Sloop of War	John Hayward	Woolwich Dockyard	Great Britain	For Royal Navy.[5]
12 September	Berrington	East Indiaman	Thomas West	Wapping	Great Britain	For British East India Company.[6]
24 October	Cruizer	Sloop of War	Ricard Stacey	Deptford Dockyard	Great Britain	For Royal Navy.[7]
7 November	Weazle	Sloop of War	John Hayward	Woolwich Dockyard	Great Britain	For Royal Navy.[8]
23 November	Hawk	Sloop of War	Benjamin Rosewell	Chatham Dockyard	Great Britain	For Royal Navy.[9]
2 December	Spy	Sloop of War	John Naish	Portsmouth Dockyard	Great Britain	For Royal Navy.[10]
Unknown date	Burgvliet	Fourth rate	Jan van Rheenen	Amsterdam	Dutch Republic	For Dutch Navy.[11]
Unknown date	Haarlem	Second rate	Jan van Rheenen	Amsterdam	Dutch Republic	For Dutch Navy.[12]