Modesto Cortázar y Leal (Briviesca (Burgos), 15 June 1783 - Madrid, 25 January 1862) was a Spanish politician and Prime Minister.
Cortázar was a member of the Progressive Party in Spain.
When the government of Valentín Ferraz y Barrau fell on 28 August 1840, he was appointed by Regent María Cristina de Borbón to form a government in which he became acting Prime Minister and also held the post of Minister of Justice. After 2 weeks, he was replaced by Vicente Sancho y Cobertores.
During the Década Moderada, he became in January 1847 President of the Congress of Deputies and in September 1847 Foreign minister in the cabinet of Florencio García Goyena.