Surname Decroix (Decroix 
) , in all the world, is quite a common cognomen. The cognomen Decroix is habitual in France, where it is quite a rare surname, Belgium, and Czechia, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in France, Belgium, and the United States. Much less frequently, Decroix is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Decroix | Belgium, Brazil, Czechia, France, United States |
| jacques joseph marie decroix French lawyer and music collector, FR (b. 1746) |
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adolphe decroix French politician, FR (b. 1810) |
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jules decroix French private banker, FR (b. 1818) |
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émile decroix French veterinarian, FR (b. 1821) |
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| ernest decroix French architect, FR (b. 1844) |
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| maurice decroix French painter (1878-1936), FR (b. 1878) |
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| charles decroix French film director, FR (b. 1900) |
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| émile decroix Belgian cyclist, BE (b. 1904) |
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| rémi decroix cyclist, BE (b. 1906) |
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| michel decroix Belgian cyclist, BE (b. 1922) |
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lieselot decroix Olympic cyclist, BE (b. 1987) |
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| marie-claire decroix Belgian athletics competitor, BE (b. 1948) |
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| chantal decroix French politician, FR (b. 1956) |
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| éric decroix footballer, FR (b. 1969) |
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| pierre decroix FR (b. 1965) |
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