Captain Henry John Peachey, 3rd Baron Selsey FRS (4 September 1787 – 10 March 1838) was a Royal Navy officer and peer.

A Fellow of the Royal Society from 1817, he was patron to several notable sculptors including Richard James Wyatt and Josephus Kendrick.

[2] The family lived at West Dean Park, a large mansion surrounded by parkland 5 miles (8 km) from Chichester, rebuilt by Peachey's father.

With the Napoleonic Wars underway, he served as first lieutenant of the 54-gun fourth-rate HMS Cornwallis on the East Indies Station.

The Dutch crew fought back, firing grapeshot and muskets at the British and attacking them with swords and pikes.

After a short engagement in which the commanding officer of Cornwallis, Captain William Montagu, described Margaretta as "defended bravely", the ship was captured by Peachey.

[2][7] A portrait of Peachey, depicting him just prior to the boarding of Margaretta, was exhibited by Sir William Beechey at the Royal Academy towards the end of 1816.

[13] Peachey returned to England with Sir Francis Drake in the following year, escorting a convoy of merchant ships valued at over £3,000,000 (equivalent to £247,300,000 in 2023).

[17][18] Peachey was patron to a number of prominent sculptors, including Joseph Nollekens, Josephus Kendrick, Richard James Wyatt, John Gibson, and Luigi Bienaimé.

[19] Peachey's library was then broken up by Ulick de Burgh, 1st Marquess of Clanricarde, who had inherited, and was sold at Sotheby's on 20 June 1872.