Isaac Nichols (29 July 1770 – 18 November 1819) was an English-born Australian farmer, shipowner and public servant who was a convict transported to New South Wales on the Third Fleet, on the Admiral Barrington.
In New South Wales he won favour with Governor Hunter and his aide-de-camp George Johnston, and was appointed chief overseer of convict gangs labouring in the Sydney area.
(Nichols had refused to assign more convicts than was correct to John Macarthur and other officers of the New South Wales Corps).
In the meantime, Nichols had added greatly to his landholdings and built a house and substantial buildings in lower George St.
Despite his earlier problems with the officers of the New South Wales Corps, he sided with them in the Rum Rebellion to depose Governor Bligh.
His home was the scene of many social functions, including the Bachelors' Ball and the annual dinners to celebrate the foundation of the colony.
They had three sons: Isaac David (1807–1867),[3] "gentleman", George Robert (1809–1857), barrister and solicitor and politician in New South Wales, and Charles Hamilton (1811–1869).