This articlerelies largely or entirely on asingle source. Relevant discussion may be found on thetalk page. Please helpimprove this article byintroducing citations to additional sources. Find sources: "Post ship" – news ·newspapers ·books ·scholar ·JSTOR(December 2009)

Post ship was a designation used in theRoyal Navy during the second half of the 18th century and theNapoleonic Wars to describe asixth-rate ship (seerating system of the Royal Navy) that was smaller than afrigate (in practice, carrying fewer than 28 guns), but by virtue of being a rated ship (with at least 20 guns), had to have as its captain apost-captain rather than alieutenant orcommander. Thus ships with 20 to 26 guns were post ships, though this situation changed after 1817. (See “1817 changes” inrating system of the Royal Navy.)

Sea officers often referred to the post ships as frigates though technically the Admiralty scrupulously never described them as such. The vessels were frigate-built, with traditionalquarterdecks andforecastles (the defining characteristic of post ships, distinguishing them from 20-gun ship-sloops), but, unlike true frigates, they lacked anorlop platform amidships. They had a high centre of gravity, which made them slow and unweatherly, but they were seaworthy. In peacetime the Royal Navy frequently used them as substitutes for frigates, especially in distant foreign stations. In wartime their slowness meant they were used mostly as convoy escorts.

Unlike other uses of the term "ship" during this era, "post ship" in itself implies nothing as regards therig of the vessel; however, all sixth rates were in practiceship-rigged, i.e. were square-rigged on three masts.

For an example of a post ship, seeHMSCamilla. She was one of tenSphinx-class post ships built during the 1770s.

The United States Navy termed ships of this type "third-class frigates."

• Lyon, David,The Sailing Navy List - all the Ships of the Royal Navy 1688-1860, Conway Maritime Press, London 1993.
• Rodger, N.A.M.The Command of the Ocean, a Naval History of Britain 1649–1815, London (2004).ISBN 0-7139-9411-8
• Winfield, Rif.British Warships in the Age of Sail: 1603–1714, Barnsley (2009)ISBN 978-1-84832-040-6
• Winfield, Rif.British Warships in the Age of Sail: 1714–1792, Barnsley (2007)ISBN 978-1-84415-700-6
• Winfield, Rif.British Warships in the Age of Sail: 1793–1817 (2nd edition), Barnsley (2008).ISBN 978-1-84415-717-4
• Winfield, Rif.British Warships in the Age of Sail: 1817–1863, Barnsley (2014)ISBN 978-1-84832-169-4.

• History of the Royal Navy
• Post ships of the Royal Navy

• Articles with short description
• Short description is different from Wikidata
• Use dmy dates from November 2017
• Use British English from November 2017
• Articles needing additional references from December 2009
• All articles needing additional references