Pilar Ribeiro | |
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| Born | Maria do Pilar Baptista Ribeiro 5 October 1911 Lisbon, Portugal |
| Died | 28 March 2011 (aged 99) Cascais, Portugal |
| Occupation | Mathematician |
| Known for | Co-founder of the Portuguese Mathematical Society |
| Spouse | Hugo Baptista Ribeiro |
Pilar Ribeiro (5 October 1911 – 28 March 2011) was a mathematician who was a founder of the Portuguese Mathematical Society (SPM) and also of the Gazeta de Matemática (Mathematics Gazette).