Demetrio Alonso Castrillo (22 December 1841 – 30 November 1916) was a Spanish politician and lawyer.
Born in Valderas, he was Minister of the Interior during the reign of Alfonso XIII
A member of the Liberal Party, he was elected successively between 1881 and 1905 and became the Congress deputy for León (province).
He served as Minister of the Interior from 2 January to 3 April 1911 in the cabinet of José Canalejas.
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