He was born in London, the son of Joseph Marryat[?], a merchant and member of Parliament. After trying to run away to sea several times, he was permitted to enter the Royal Navy in 1806, as a midshipman[?] on board the HMS Imperieuse[?], a frigate commanded by Lord Thomas Cochrane (who would later serve as inspiration for both Marryat and other authors).
Marryat's time aboard the Imperieuse included action off the Gironde, the rescue of a fellow midshipman who had fallen overboard, captures of many ships off the Mediterranean coast of Spain, and the capture of the castle of Mongat[?]. When the Imperieuse shifted to operations in the Scheldt, in 1809, Marryat contracted malaria, and returned to England on the HMS Victorious[?], 74.
After recuperating, Marryat returned to the Mediterranean in HMS Centaur[?], 74, and once again saved a shipmate by leaping into the sea after him. He then sailed as a passenger to Bermuda on the HMS Atlas[?], 64, and from thence to Halifax on the schooner Chubb, to join the frigate HMS Aeolus[?] of 32 guns (April 27, 1811).
A few months later, Marryat again earned distinction by leading the effort to cut away the Aeolus mainyard[?] to save the ship during a storm, and continuing a pattern, he also saved one of the men from the sea. Shortly thereafter, he moved to the frigate HMS Spartan[?], participating in the capture of a number of American ships (the War of 1812 having begun by then), and on December 26, 1812 was promoted to lieutenant.
As lieutenant, Marryat served in the sloop Espiegle and in the Newcastle, and was promoted to commander June 13, 1815, just in time for peace to break out. He then pursued scientific studies, invented a lifeboat (thus earning both a gold medal from the Royal Human Society[?] and the nickname "Lifeboat"), and in 1819 married Catherine Shairp[?].
In 1823 he was appointed to HMS Larne[?], 20, and took part in an expedition against Burma in 1824. During this expedition, which resulted in large losses due to disease, he was promoted to command the HMS Tees[?], 28, and this gave him his post captain[?] rank. He was back in England in 1826.
In 1829 he was commanding the frigate HMS Ariadne[?] on a mission to search for shoals[?] around the the Madeira and Canary Islands. This was an uninspiring exercise, and between that and the recent publication of his first novel, The Naval Officer, he decided to resign his commission in November 1830 and take up writing fulltime.
Regular production soon followed, with his biggest success, Mr Midshipman Easy, coming in 1836. He lived in Brussels for a year, travelled in Canada and the United States, then moved to London in 1839, where he was in the literary circle of Charles Dickens and others.
Marryat's novels are characteristic of their time, with the concerns of family connections and social status often overshadowing the naval action, but they are interesting as fictional renditions of the author's 25 years of real-life experience at sea. These novels, much admired by Joseph Conrad and Ernest Hemingway, were among the first sea novels. They were models for later works by C. S. Forester and Patrick O'Brian that were also set in the time of Nelson and told the stories of young men rising through the ranks through successes as naval officers.
His later novels were generally for the children's market.
Oliver Warner, Captain Marryat: a Rediscovery (1953).