| Ipomoea splendor-sylvae House, 1907 |
| Ipomoea squamosa Choisy, 1845 |
| Ipomoea stans Cav., 1794 |
| Ipomoea steerei (Standl.) L.O. Williams, 1970 |
| Ipomoea stolonifera (Cirillo) J.F. Gmel., 1791 |
| Ipomoea suaveolens (M. Martens & Galeotti) Hemsl., 1882 |
| Ipomoea suffulta (Kunth) G. Don, 1838 |
| Ipomoea tabascana J.A. McDonald & D.F. Austin, 1990 |
| Ipomoea tacambarensis E. Carranza, 2003 |
| Ipomoea tastensis Brandegee, 1903 |
| Ipomoea tehuantepecensis L. Torres, R. Torres, M.P. Ramírez & J.A. McDonald, 2008 |
| Ipomoea temascaltepecensis Wilkin, 1995 |
| Ipomoea tentaculifera Greenm., 1898 |
| Ipomoea tenuiloba Torr., 1859 |
| Ipomoea tenuiloba var. lemmonii (A. Gray) Yatsk. & C.T. Mason, 1984 |
| Ipomoea tenuiloba var. tenuiloba Torr., 1859 |
| Ipomoea teotitlanica McPherson, 1980 |
| Ipomoea ternifolia Cav., 1799 |
| Ipomoea ternifolia subsp. leptotoma (Torr.) J.R.I. Wood & Scotland, 2020 |
| Ipomoea ternifolia var. leptotoma (Torr.) J.A. McDonald, 1995 |