Manuel Buenacasa Tomeo (1886–1964) was a Spanish militant anarchist, general secretary and chronicler of the Confederación Nacional del Trabajo (CNT) and Federación Anarquista Ibérica (FAI) trade unions.

He trained for priesthood in a Franciscan seminary in Villanueva del Aceral, but left as a late teen to become a carpenter in his home province.

He became a member of the Confederación Nacional del Trabajo (CNT) labor union in 1914, and joined its national committee four years later.

[2] From 1923 to 1930, the years of the Miguel Primo de Rivera dictatorship, Buenacasa went into exile multiple times.

[3] Though he remained a lifelong militant anarchist, Buenacasa opposed the terrorist actions in the name of anarchism.