Horndon may refer to the following places:
- Horndon, Devon, a location in England
- Horndon railway station, Essex, England
- Horndon-on-the-Hill, a village in Essex, England
- Horndon mint, a mint
- West Horndon, a village in Essex, England
- East Horndon, a village in Essex, England
- Darfield, New Zealand, formerly Horndon Junction