Eugenio Montero Ríos (13 November 1832 Santiago de Compostela – 12 May 1914 Madrid) was a leading member of the Spanish Liberal Party before being part of a 1903 schism that divided it.
He also served briefly as Prime Minister of Spain.
He played a role in the 1898 Treaty of Paris that ended the Spanish–American War as he was then President of the Senate of Spain.