| 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 |
| Croton strigosus Spreng., 1822 |
| Croton stylosus Müll. Arg., 1865 |
| Croton suaveolens Torr., 1858 |
| Croton subcapitatus Müll. Arg., 1874 |
| Croton suberosus Kunth, 1817 |
| Croton subfragilis Müll. Arg., 1865 |
| Croton subjucundus Croizat, 1942 |
| Croton subtomentosus L., 1759 |
| Croton sutup Lundell, 1940 |
| Croton sylvaticus Schltdl., 1846 |
| Croton tabascensis Lundell, 1940 |
| Croton tacanensis Lundell, 1940 |
| Croton tenuilobus S. Watson, 1886 |