Manuel António Ribeiro (13 December 1878 – 27 November 1941) was a Portuguese writer, poet, and relevant political figure during the First Portuguese Republic. He is known for his role as an active proponent of syndicalism in the early 20th century, as the founder of the first Bolshevist organisation in Portugal (the Portuguese Maximalist Federation), as well as one of the first organisers of the Portuguese Communist Party.
