| Harrisella porrecta (Rchb. f.) Fawc. & Rendle, 1909 |
| Hartwegia Nees, 1831 |
| Hartwegia bergeriana Schltr., 1906 |
| Hartwegia gemma Rchb. f., 1878 |
| Hartwegia purpurea Lindl., 1837 |
| Hartwegia purpurea var. angustifolia Booth ex Lindl., 1843 |
| Helleborine Moench, 1794 |
| Helleborine gigantea (Douglas ex Hook.) Druce, 1909 |
| Helleriella A.D. Hawkes, 1966 |
| Helleriella guerrerensis Dressler & Hágsater, 1975 |
| Helleriella nicaraguensis A.D. Hawkes, 1966 |
| Heteranthocidium Szlach., Mytnik & Romowicz, 2006 |
| Heteranthocidium pollardii (Dodson & Hágsater) Szlach., Mytnik & Romowicz, 2006 |
| Heterotaxis Lindl., 1826 |
| Heterotaxis crassifolia Lindl., 1826 |
| Heterotaxis faecalis Archila & Chiron, 2014 |
| Heterotaxis maleolens (Schltr.) Ojeda & Carnevali, 2005 |
| Heterotaxis sessilis (Sw.) F. Barros, 2002 |
| Hexadesmia Brongn., 1842 |
| Hexadesmia confusa Schltr., 1912 |