Horehound or hoarhound may refer to:
Plants
- Ballota (also horehound), a genus of flowering evergreen perennial plants and subshrubs in the family Lamiaceae
- Ballota acetabulosa (also Greek horehound), a species of flowering plant in the family Lamiaceae
- Ballota nigra (also black horehound), a perennial herb of the family Lamiaceae
- Ballota undulata (also horehound), a species of flowering plant in the family Lamiaceae
- Lycopus (also waterhorehound), a genus in the family Lamiaceae
- Lycopus americanus (also American water horehound), a member of the genus Lycopus
- Lycopus amplectens (also water-horehound and sessile-leaved water-horehound), a species of Lycopus native to North America
- Lycopus virginicus (also Virginia water horehound and American water hoarhound), a species of flowering plant in the mint family
- Marrubium (also horehound or hoarhound), a genus of flowering plants in the family Lamiaceae
- Marrubium vulgare (also white horehound or common horehound), a flowering plant in the mint family
Other