Thellusson is a surname. Notable people with the name include:
Charles Thellusson (1770–1815), British banker and politician Claud Thomas Thellusson Wood MC (1885–1961), Bishop of Bedford Thomas Thellusson Carter (1808–1901), significant figure in the Victorian Church of England Frederick Thellusson, 4th Baron Rendlesham (1798–1852), British Conservative Party politician Frederick Thellusson, 5th Baron Rendlesham (1840–1911), British Conservative politician Georges-Tobie de Thellusson (1728–1776), French-Swiss banker Peter Thellusson (1737–1797), French–Swiss businessman and banker who settled in London Peter Thellusson, 1st Baron Rendlesham (1761–1808), British merchant, banker and politician
See also Thellusson v Woodford (1799) 4 Ves 227 is an English trusts law case Hôtel Thellusson, luxurious hôtel particulier, built in 1778 by Claude-Nicolas Ledoux