Geoffrey I (Gauzfred I) (d. after 985), possibly the son of Geoffroy, Viscount of Chartres, is the first Viscount of Châteaudun and thus regarded as the founder of the House of Châteaudun, vassal of the House of Blois.
- Occupation
- feudatory
- Position held
- Count of Châteaudun
- Citizenship
- France
- Died
- 989