List of corvette and sloop classes of the Royal Navy


This is a list of corvette and sloop classes of the Royal Navy. The original term for ships of fewer than 28 guns, but at least 20 guns, was "post ship"; the term 'corvette' was not introduced into the Royal Navy until the 1830s, and at that time its use replaced both the larger sloops and also what had previously been categorised officially as 'post ships', i.e. ships of 20, 22 or 24 guns which were so-called because they were the lowest grade of warship which could be commanded by a 'post captain'; as such, they formed the lower portion of the sixth rate.
In 1887, both frigates and corvettes were merged into a new category of 'cruiser'. In 1937, escort sloops were officially re-rated as escort vessels and patrol sloops as patrol vessels, although the traditional term continued in use. In 1948 surviving sloops and corvettes were redesignated as frigates.
Note that vessels captured from other countries and incorporated into the Royal Navy are not included in the following lists.

Corvette classes

Late 17th-century post ship classes

This section lists the 'post ships' of 20 to 24 guns which in the 1830s would be merged with the larger sloops to form the new category of corvette. From 1817 the upper limit would be raised to 28 guns.
After more than half a century, the category of corvette was revived during WW2 to describe a smaller form of escort vessel than the existing sloops. It was thus not comparable with the pre-1887 corvettes in the Royal Navy. Two classes of wartime corvette were designed and built in considerable numbers :

Sloops (early single-masted type)

Note that early sloops were single-masted, including the Swift, Jamaica and Hazard groups listed below for 1700–1711; however, all surviving sloops by 1716 had been re-rigged as two-masted, and all new sloops continued to be two-masted until the 1750s, when three-masted – ship-rigged – sloops were introduced.
All early two-masted sloops were mainly either ketch-rigged or snow-rigged.
From the outbreak of the War of Jenkins' Ear in 1739, the Navy recognised that there was a growing need for smaller vessels for amphibious operations, as escorts for commercial traffic and for minor combatant roles. Over the next six years, some 36 specialist vessels were procured, as listed below; of these, the first four were essentially repeats of the previous group of 200-ton sloops of 1732, while the later vessels were progressively enlarged. In addition, a small number were captured from the Spanish during this era, and a dozen bomb vessels of similar construction supplemented the purpose-built sloops in a cruising role.
Ship sloops were built frigate-style, and initially were referred to as frigates, in spite of their size and relative lack of guns.
This table excludes the small gun-brigs that were built in considerable numbers during this period:
for these gun-brigs see List of gun-brigs of the Royal Navy
Between 1815 and 1826 numerous additional brig-sloops of the wartime Cherokee class were ordered; these have been included with the numbers mentioned in the previous section.
These vessels were initially rated as steam vessels until 1844, when the category of steam sloops was created.
In 1852 six of the screw sloops were reclassed as corvettes, while four others remained sloops.