Lucas de Groot (born 21 June 1963 in Noordwijkerhout, the Netherlands), known professionally as Luc(as) de Groot, is a Dutch type designer. He is the head of the type foundry Fontfabrik.
He is mostly known for the very large font family Thesis (TheSans, TheSerif, TheMix, TheSansMono and later TheAntiqua)  and Corpid (previously AgroSans).
De Groot has also designed various custom fonts for particular clients: Calibri and Consolas for Microsoft; SunSans for Sun Microsystems; SpiegelSans and Taz for, respectively, the German magazines Der Spiegel and die tageszeitung; and FolhaSerif for the Brazilian newspaper Folha.
De Groot teaches at the Design Faculty of the University of Applied Sciences, Potsdam, Germany.
Fonts designed by Lucas