De Haas is a Dutch surname. Meaning "the hare", its origin may be descriptive or the name of an address.[1] Among variant forms are De Haes, DeHaas, Dehaes, and Den Haas. People with this name include:
- De Haas / DeHaas
- Darius de Haas (born 1968), American stage actor and singer
- Deborah DeHaas (born 1959), American businesswoman
- Geertruida de Haas-Lorentz (1885–1973), Dutch physicist, daughter of Hendrik Lorentz, wife of Wander Johannes de Haas
- Irma de Haas (born 1975), Dutch volleyball player
- Jack de Haas (1875–1940), Dutch draughts player
- Jacob de Haas (1872–1937), British Hasidic Jew and a leader for modern Zionism movement
- Johannes Hubertus Leonardus de Haas (1832–1908), Dutch animal and landscape painter
- John Philip De Haas (c1735-1786), Dutch–born British and American military officer
- Mauritz de Haas (1832–1895), Dutch-born American painter
- Nico de Haas (1907–2000), Dutch graphic-designer
- Saskia de Haas, Dutch cellist
- Troy de Haas (born 1979), Australian athlete
- Walter de Haas (1886–1969), better known under the pseudonym Hanns Günther, German author, translator, and publisher of popular scientific works
- Wander Johannes de Haas (1878–1960), Dutch physicist
- William Frederick de Haas (1830–1880), Dutch-born American painter
- De Haes / Dehaes
- Carlos de Haes (1829–1898), Belgian-born Spanish painter
- Frans De Haes (1895–1923), Belgian weightlifter
- Gilles De Haes (1597–1657), Flemish soldier, general of the Army of Tyrol, governor of Dalmatia
- Jos De Haes (1920–1974), Flemish writer and poet
- Kenny Dehaes (born 1984), Belgian racing cyclist