Gerard III may refer to:
- Gérard III, Count of Rieneck (d. 1216)
 - Gerard III, Count of Guelders (d. 1229)
 - Gérard de Dainville (d. 1378), Bishop of Cambrai as Gerard III
 
See also
- Gerhard III, Count of Holstein-Rendsburg (d. 1340)
 
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