This is a list of companies of Spain in alphabetical order.
- Agbar (water)
- Agroman (construction)
- Altadis (tobacco and logistics)
- Almirall Prodesfarma (pharmaceuticals)
- Astra (guns)
- Banco Bilbao Vizcaya Argentaria (BBVA) (banking)
- Banco Popular Español (banking)
- CAF (railway carriages)
- CASA (Construcciones Aeronáuticas SA) (aircraft)
- Cepsa (oil)
- El Corte Inglés (department stores)
- Endesa (electricity)
- Eroski (distribution)
- Expal (ammunition)
- Explosivos Río Tinto (explosives)
- Fomento de la Construcción (construction)
- Freixenet (wine)
- Gas Natural (energy)
- La Caixa (savings bank)
- Lladró (porcelaine figures)
- Iberia (Líneas Aéreas de España) (national airline)
- Iberdrola (industrial group)
- Inditex (Zara) (textiles)
- Majorica (jewelry)
- Mapfre (insurances)
- Mondragón Corporación Coooperativa (cooperative holding)
- NH Hoteles (hotels)
- Pascual Hermanos (food)
- RENFE (national railways)
- Repsol YPF (oil)
- Santander Central Hispano (banking)
- SEAT (cars)
- SEPI (Sociedad Estatal de Participaciones Industriales) (Government holding company)
- Sol Meliá (hotels)
- Spanair (airline)
- Talgo (railway locomotives and carriages)
- Telefónica (telecommunications)
