Delcroix is a French surname derived from de la Croix ("of the Cross"). Notable people with the surname include:

Catherine Delcroix (born 1955), French sociologist Jean-Loup Delcroix (1924–2003), French physicist (1894-1982), German actor Leo Delcroix (1949–2022), Belgian politician Ludo Delcroix (born 1950), Belgian cyclist (born 1967), French writer and journalist Patrick Delcroix (born 1963), French dancer and choreographer Tobias Delcroix (born 1997), French photographer

See also Decroix de la Croix Delacroix