Leonor Tomásia de Távora, 3rd Marchioness of Távora (15 March 1700 - 13 January 1759, Lisbon) was a Portuguese noblewoman, most notable for being one of those executed during the Távora affair.
Leonor Tomásia de Távora was born on 15 March 1700 to Luís Bernardo de Távora, 5th Count of São João da Pesqueira, and Ana de Lorena, daughter of Nuno Álvares Pereira de Melo, 1st Duke of Cadaval. She was mother to Luís Bernardo de Távora, and grandmother to Leonor de Almeida Portugal, 4th Marquise of Alorna
- (Portuguese) Távora, Luíz de Lencastre. D. Leonor de Távora. O Tempo da Ira. O Processo dos Távora. Quetzal Editores. 2002