The Castle of Algoso is a medieval castle in the civil parish of Algoso, Campo de Víboras e Uva, municipality of Vimioso, in the Portuguese district of Bragança. The castle of Algoso is one of the most important medieval fortifications in the eastern Trás-os-montes, related with the battles of Leonese succession, the tentative policies of the independent Portuguese monarch and the important religious commandery of the Knights Hospitaller that established their roots in 1224.