English: Agustín Manuel de Eyzaguirre y Arechavala (May 3, 1768 – July 19, 1837) was a Chilean political figure. He served as Provisional President of Chile between 1826 and 1827. He was born in Santiago, Chile, the son of the Basque Domingo Eyzaguirre Escutasolo and of María Rosa de Aretxabala y Alday. He studied law and theology at the Real Universidad de San Felipe, graduating in 1789. Originally he wanted to become a priest, but later changed his mind, and decided to take over the family hacienda in Calera de Tango. He married María Teresa de Larraín y Guzmán Peralta on September 13, 1808. During all the rest of his life he dedicated himself to the commerce and the management of his lands.