De Haas as a surname can refer to:
Darius de Haas (born 1968), American stage actor and singerGeertruida de Haas-Lorentz (1885–1973), Dutch physicist, daughter of Hendrik Lorentz, wife of Wander Johannes de HaasJacob de Haas (1872–1937), British Hasidic Jew and a leader for modern Zionism movementJohannes Hubertus Leonardus de Haas (1832–1908), Dutch animal and landscape painterMauritz de Haas (1832–1895), Dutch-born American painterNico de Haas (1907–2000), Dutch graphic-designerSaskia de Haas, Dutch cellistTroy de Haas (born 1979), Australian athleteWalter de Haas (1886–1819?), better known under the pseudonym Hanns Günther, German author, translator, and publisher of popular scientific worksWander Johannes de Haas (1878–1960), Dutch physicistWilliam de Haas (1830–1880), Dutch-born American painter