| Hacrobiae | EUKARYA>CHROMALVEOLATA>HACROBIAE |
| Halobacteria | ARCHAEA>EURYARCHAEOTA>HALOBACTERIA |
| Haplomitriopsida | see Marchantiophyta |
| Haptomonada | EUKARYA>CHROMALVEOLATA>HACROBIAE>HAPTOMONADA |
| Hemichordata | EUKARYA>UNIKONTA>OPISTHOKONTA>ANIMALIA>BILATERIA>DEUTEROSTOMATA>HEMICHORDATA |
| Heterokontae | EUKARYA>CHROMALVEOLATA>HETEROKONTAE |
| Heterolobosea | EUKARYA>EXCAVATA>DISCICRISTATAE>HETEROLOBOSA |
| Hexapoda | EUKARYA>UNIKONTA>OPISTHOKONTA>ANIMALIA>BILATERIA>PROTOSTOMATA>ECDYSOZOA>PANARTHROPODA>ARTHROPODA>PANCRUSTACEA>HEXAPODA |
