Admiral of the Blue Robert Linzee (1739 – 4 October 1804) was a Royal Navy officer who served in the American War of Independence and the French Revolutionary and Napoleonic Wars.

Linzee entered the navy and was promoted to lieutenant during the Seven Years' War. He was advanced to his own commands shortly before the outbreak of the American War of Independence and served off the North American coast and in the Caribbean during that conflict. He saw important service against privateers as a frigate captain before advancing to command a ship of the line despite the loss of one of his ships. He saw action in several important battles, commanding a ship at the Battle of the Saintes and at the Battle of the Mona Passage. Left without a ship after the peace, he briefly commissioned a ship during the Spanish Armament, but paid her off after the crisis passed.

He was back in service after the outbreak of the French Revolutionary Wars, taking a ship out to the Mediterranean, and quickly being appointed a commodore with orders to assist the Corsican patriots against the French. Linzee commanded a small squadron in the area supporting Corsican and British efforts to dislodge the French. He later became a junior flag officer in the Mediterranean Fleet. He fought in two fleet actions in 1795, at Genoa and then at Hyères Islands. He returned to Britain shortly after Sir John Jervis took over command in the Mediterranean. He did not serve at sea again, though he continued to be promoted, rising to the rank of admiral of the blue before his death in 1804.

Robert Linzee was born in Portsmouth, Hampshire in 1739 and baptised there on 13 February 1740, the youngest child of five sons and five daughters born to Edward Linzee and his wife Anne Newnham. Edward Linzee was a burgess and several times mayor of Portsmouth and the Linzees were a significant local family.

Linzee entered the navy and saw service during the Seven Years' War, being promoted to lieutenant on 29 January 1761. He was advanced to commander on 25 November 1768 and given command of the 10-gun sloop HMS Viper, based at Boston in 1769. His promotion to post-captain followed soon after, on 3 October 1770, and took command of the 50-gun HMS Romney that month. Romney was at this time flying the broad pennant of Commodore Samuel Hood, and Linzee remained in command until she was paid off in March 1771.

In February 1775 he took command of the new 28-gun sixth rate HMS Surprize and sailed for Newfoundland in May that year. He participated in the Relief of Quebec the following year, before undertaking cruises against American shipping. Surprize captured the American privateers Maria, on 7 May, and Gaspee, on 15 May 1776. Linzee returned to Newfoundland in January the following year, spending 1777 and part of 1778 off the North American coast, capturing another American privateer, Harlequin, on 7 September 1778. Linzee then took Surprize back to Britain to be refitted and coppered. Linzee's next command, from 1780, was the 32-gun HMS Thetis. He was sent out as a convoy escort under the command of Captain Sir John Moutray, and managed to escape when the convoy was largely overwhelmed and captured on 9 August 1780 by a Spanish fleet under Luis de Córdova y Córdova. Linzee then joined the squadron dispatched to the West Indies under Samuel Hood in November 1780, and remained serving in the Leeward Islands the following year. On 12 May 1781 Thetis struck a rock off Saint Lucia and was wrecked.

Linzee's career survived the customary court martial for the loss of his ship and in November 1781 he commissioned the 74-gun HMS Magnificent for service. He resumed his service in the Caribbean by returning to the Leeward Islands in February 1782, and went on to see action in a number of important engagements between British and French fleets. He was present with Admiral Sir George Rodney's fleet at the first indecisive clash with the Comte de Grasse's force in the Dominica Channel on 9 April, and then again at Rodney's decisive victory over de Grasse three days later at the Battle of the Saintes on 12 April. Linzee was one of those dispatched a few days later under Sir Samuel Hood to search for more French ships, and was in action again on 19 April at the Battle of the Mona Passage. In the British victory that resulted, Magnificent played a significant role in chasing down and capturing the 32-gun frigate Aimable, at the cost to herself of four killed and eight wounded.

Linzee left the Caribbean for North America in July 1782 with Admiral Hugh Pigot's force, and spent September and October at New York. He participated in the blockade of Cap-François in November 1782, and on 12 February 1783 Magnificent sailed from Gros Islet Bay on a cruise in company with the 64-gun ships HMS Prudent and HMS St Albans. On 15 February 1783 Magnificent sighted the 36-gun French frigate Concorde and gave chase. She was close enough to identify the mysterious ship as a frigate by 18:00, and by 20:00 as darkness fell Concorde opened fire on her pursuer with her stern guns. Magnificent overhauled the French ship by 21:15, and after fifteen minutes forced her to strike her colours. Magnificent took possession of Concorde, described as carrying 36 guns and 300 men and under the command of M. le Chevalier du Clesmaur. Shortly after her surrender the Concorde's maintopsail caught fire, forcing the crew to cut away the mainmast to extinguish it. Prudent and St Albans came up two hours later and Magnificent towed Concorde to St. John's, Antigua. The American War of Independence ended shortly afterwards, and Linzee took Magnificent back to Britain to be paid off.