Mercedes Valdés Cuevas de Barros Luco (; 1843 – 4 September 1926) was a Chilean philanthropist and First Lady during 1910 to 1915.

Biography Valdés was born in 1843 in Santiago to Francisco de Borja Valdés Aldunate and Alejandra Cuevas Avaria. Through her father Valdés was a member of the . Valdés was the sister of the politicians and José Florencio Valdés Cuevas.

In 1895, Valdés married Ramón Barros Luco, a lawyer, politician and future 16th President of Chile.

Following her husband's death in 1919, Valdés gave a sufficient donation to the .

On 4 September 1926 Valdés died in Santiago. Upon her death Valdés bequeathed her assets to the Institute of Evangelical Charity "Fraternity of Sorrows" (), () and the Hospital Barros Luco Trudeau. Valdés was buried at the Santiago General Cemetery.

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