| Tillandsia occulta H. Luther, 1997 |
| Tillandsia orizabensis Baker, 1888 |
| Tillandsia orogenes Standl. & L.O. Williams, 1953 |
| Tillandsia ortgiesiana E. Morren ex Mez, 1896 |
| Tillandsia orthorhachis Mez & C.F. Baker, 1903 |
| Tillandsia pacifica Ehlers, 1991 |
| Tillandsia palmasolana Matuda, 1973 |
| Tillandsia pamelae Rauh, 1986 |
| Tillandsia paniculata Schltdl. & Cham., 1831 |
| Tillandsia paniculata var. genuina Mez, 1896 |
| Tillandsia paraisoensis Ehlers, 1992 |
| Tillandsia parryi Baker, 1887 |
| Tillandsia patens Willd. ex Schult. & Schult. f., 1830 |
| Tillandsia patriae Rauh, 1976 |
| Tillandsia patriae var. laxiflora Rauh, 1976 |
| Tillandsia patriae var. patriae Rauh, 1976 |
| Tillandsia pauciflora Sessé & Moc., 1894 |
| Tillandsia penascoensis Ehlers & Lautner, 2004 |
| Tillandsia pendula Thunb. ex C.F. Gaertn., 1805 |
| Tillandsia phyllostachya Baker, 1888 |