Charles Augustus Fitzroy Fitzsimons (9 November 1850 – 19 July 1921) was a jeweller and engraver in Sydney, Australia. He was the illegitimate son of the Governor of NSW, Sir Charles Augustus FitzRoy. Through his father, the Governor, Charles' family tree can be traced back nearly a thousand years in the patrilineal descent, as the Governor is descended from the Fitzroy's, the Dukes of Grafton, who in turn are descended from Charles II.