Daniel Oliver Guion (London, 20 April 1776 – Ringkøbing, 24 December 1811) was an officer of the Royal Navy. He was the son of Daniel Guion (1742–1780) – a Merchant who was befriended and professionally involved with Oliver Toulmin (Navy Agent), Major David Parry (a close friend to William Petty, 2nd Earl of Shelburne) and Henry Cort and lived for some years in 35 Crutched Ffriars opposite to the Office of the Royal Navy – and Ann (Harwood) who would be Matron of the London Hospital 1790–1797. He was the brother of Captain Gardiner Henry Guion. The Guion family were Huguenots and probably related to the family de Guyon de Geis from France. Another Huguenot branch of this family is still living in England and a famous member of this family is Richard Debaufre Guyon, general in Hungarian and Turkish service.
Guion was appointed lieutenant on 18 April 1794, to commander on 22 May 1796 and to captain on 21 May 1802.
In 1801 Commander Guion was captain of Eurus, a 32-gun frigate, armed "en flute", with most of her guns removed, one of the 28 troop ships in Admiral Lord Keith`s fleet which carried 16,500 soldiers to Aboukir Bay on 2 March 1801. They began disembarking on the 8th. Daniel Guion was one of the five commanders put on shore under Sir Sidney Smith in charge of a battalion of 1000 seamen to co-operate with the army. Along with the other captains who had served in Egypt he was awarded a Turkish gold medal by the Grand Signior. In 1802 he was promoted to post-captain and appointed to the 50-gun HMS Trusty 1782 another troopship.