Thomas Blanchet (French pronunciation: [tɔma blɑ̃ʃɛ]; 1614 – 21 June 1689) was a French painter, draughtsman, architect, sculptor and printmaker.
During his training there, Blanchet met Jacques Sarazin, and on his advice moved from studying sculpture to painting.
He stayed in Rome from c.1645 to 1653 and worked with artists in Nicolas Poussin's circle, as well as visiting the studios of Andrea Sacchi and Pietro da Cortona.
He was highly praised by Gianlorenzo Bernini, who he also visited.
Blanchet produced paintings for Niccolo Guido di Bagno (1584–1663), made engravings of ancient tombs and views or prospettive and a mausoleum for Rene de Voyer d'Argenson, French ambassador to Venice in San Giobbe, Venice (1654).