| Eupatorium trinionum McVaugh, 1972 |
| Eupatorium tubiflorum Benth., 1841 |
| Eupatorium tuerckheimii Klatt, 1884 |
| Eupatorium tulanum Klatt, 1882 |
| Eupatorium tunii L.O. Williams, 1975 |
| Eupatorium turbinatum A. Gray, 1879 |
| Eupatorium ultraisthmium McVaugh, 1972 |
| Eupatorium uniflorum Sessé & Moc., 1889 |
| Eupatorium vanillosmoides Sch. Bip. ex Baker, 1876 |
| Eupatorium venulosum A. Gray, 1886 |
| Eupatorium vernale Vatke & Kurtz, 1871 |
| Eupatorium vernicosum Sch. Bip. ex Greenm., 1904 |
| Eupatorium veronicifolium Kunth, 1818 |
| Eupatorium vetularum Standl. & Steyerm., 1944 |
| Eupatorium viburnoides DC., 1836 |
| Eupatorium virgatum Schrad., 1829 |
| Eupatorium viscidipes B.L. Rob., 1901 |
| Eupatorium viscosissimum Rolfe, 1906 |
| Eupatorium vitifolium Sch. Bip., 1884 |
| Eupatorium vulcanicum Benth., 1853 |