| Croton scandens Sieber ex C. Presl, 1845 |
| Croton schiedeanus Schltdl., 1847 |
| Croton scordioides Lam., 1786 |
| Croton septemnervius McVaugh, 1961 |
| Croton sericeus Schltdl., 1830 |
| Croton sessiliflorus Sw., 1788 |
| Croton setiger Hook., 1838 |
| Croton shepherdiifolius Schauer, 1847 |
| Croton shreveanus Croizat, 1945 |
| Croton siltepecensis Lundell, 1942 |
| Croton sitiens Brandegee, 1922 |
| Croton soliman Cham. & Schltdl., 1831 |
| Croton sonorae Torr., 1858 |
| Croton sousae Mart. Gord. & Cruz Durán, 2002 |
| Croton sphaerocarpus Kunth, 1817 |
| Croton spicatus Bergius, 1768 |
| Croton standleyanus Croizat, 1940 |
| Croton stenopetalus G.L. Webster, 2001 |
| Croton steyermarkianus Croizat, 1940 |
| Croton stipulaceus Kunth, 1817 |