Valentí Almirall i Llozer (bələnˈti əlmiˈɾaʎ; Barcelona, Catalonia, Spain, 8 March 1841 – 1904) was a Catalan politician, considered one of the fathers of modern Catalan nationalism, and more specifically, of the left-wing variety.
Almirall was a student of the School of Fine Arts in Barcelona but had to leave after criticising the Professor Claudi Lorenzale. In the University of Barcelona, he studied philosophy between 1854 and 1857
Almirall was originally a federal republican who campaigned for the Catalan Countries to be united to form an administrative entity as a part of a Spanish Federal Republic. He participated in the Glorious Revolution of 1868. His wealth and the little vocation he had as a lawyer pushed him into politics. He participated in the preparation and the facts of the revolution of 1868 in Barcelona, directed the newspaper El Federalista (The Federalist) and collaborated with the Feder