- Robert Jordan – American university instructor of the Spanish language and a specialist in demolitions and explosives.
- Anselmo – Elderly guide to Robert Jordan.
- Golz – Soviet officer who ordered the bridge's demolition.
- Pablo – Leader of a group of anti-fascist guerrillas.
- Rafael – Well-intentioned yet incompetent and lazy guerrilla, and a gypsy.
- María – Robert Jordan's young lover.
- Pilar – Pablo's wife. An aged but strong woman, she is the de facto leader of the guerrilla band.
- Karkov – Soviet agent and journalist in Madrid, and a friend of Jordan's.
- Agustín – Foul-mouthed, middle-aged guerrilla.
- El Sordo – Leader of a fellow band of guerrillas.
- Fernando – Middle-aged guerrilla.
- Andrés and Eladio – Brothers and members of Pablo's band.
- Primitivo – Old guerrilla in Pablo's band.
- Joaquín – Enthusiastic teenaged communist, a member of Sordo's band.
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