Pilar is Portuguese and Spanish for pillar. It has assumed a great religious significance due to
- Nuestra Señora del Pilar (Our Lady of the Pillar), the name given to the Blessed Virgin Mary for her appearance in Spain, where she is commonly depicted as standing on top of a pillar
- María del Pilar (Mary of the Pillar), derived from the above, is a common female name in Latin American countries. In Spain, it is usually abbreviated to Pilar, and as such developed into a name in its own right.