Octavius Wigram (18 December 1794 – 20 May 1878) was an English businessman and ship owner in the City of London, a member of Lloyds and Governor of the Royal Exchange Assurance Corporation.
Born at Walthamstow House, Walthamstow, on 18 December 1794, despite his name Wigram was the twelfth child and seventh son of Sir Robert Wigram, 1st Baronet (1744–1830), a merchant shipbuilder and Tory politician who had a total of twenty-three children. He was educated privately at Shacklewell, and at the age of sixteen he entered his father's counting-house. In 1819 he became a director of the Royal Exchange Assurance Company, remaining with the company until his death.
Wigram joined the London and Westminster Light Horse (a Volunteer regiment) as a trooper. At the coronation of King George IV at Westminster Abbey in 1820, Wigram was on duty, guarding one of the doors of the Abbey, when the new king's estranged wife Queen Caroline tried unsuccessfully to enter the Abbey by force. She was turned away. In 1822 he was commissioned as a cornet in the same regiment.
From 1823 to 1831 Wigram is listed as the owner of two ships in the service of the East India Company. In 1824 he was elected a member of Lloyds, and on 24 March 1824 was married at St George's, Hanover Square, by William Knox, Bishop of Derry, to the bishop's daughter, Isabella Charlotte, who was a niece of Thomas Knox, 2nd Viscount Northland, later created Earl of Ranfurly. They had three sons and three daughters. Until 1830 the Wigrams lived at 36, Wimpole Street, Westminster. They then moved to Thorpe Combe House and in 1841 to Dulwich.