Thomas Grissell (4 October 1801 – 26 May 1874) was an English public works contractor who was responsible for constructing a number of buildings in England.
Together Grissell and Peto built up a rapidly growing business, controlling all their operations from stone-quarrying to the manufacture of fittings for their buildings.
Grissell claimed to have made innovations in building technique, including a form of braced and bolted timber scaffolding.
Two of his brothers, Henry and Martin, founded the Regent's Canal Iron foundry and constructed major ironworks.
From about 1847 he lived at 19 Kensington Gardens, London in one of a pair of houses designed in Barry's offices and built by Grissell's firm.