| Hypothermie | hypothermia |
| Hyperthermie | hyperthermia |
| Hypnotherapie | hypnotherapy |
| Hypothese | hypothesis |
| Geothermie | geothermal power geothermy |
| Hypogamie | hypogamy |
| Hypotheka | hypotheca |
| Hyponymie | hyponymy |
| Hypotenuse | hypotenuse |
| Hypothek | mortgage |
| Hypothekar | mortgagee |
| Hypothyreose | hypothyroidism |
| Hypotonie | hypotension hypotonia hypotonicity |
| Hypovolämie | hypovolæmi |
| Hypästhesie | hypaesthesia |
| Geothermik | geothermics |
| Homoiothermie | homoiothermy warm-bloodedness |
| Hydrotherapie | hydrotherapy |
| Isotherme | isotherm |
| Diphtherie | diphtheria |