Marian Walentynowicz was a Polish graphic artist, architect, teacher, writer and a precursor to the comic book in Poland.

He is probably best known for his collaboration as illustrator with Kornel Makuszyński in their creation of Koziołek Matołek, a popular classic children's series about a billy goat.

Walentynowicz studied Architecture at the Warsaw Polytechnic. During the 1930s he taught at the Women's Architectural Academy in Warsaw (Żeńska Szkoła Architektury im. S. Noakowskiego). From the 1920s onwards he worked as an illustrator for various Warsaw publications. During the Second world war, he was the war correspondent attached to General Stanisław Maczek's First Panzer division. While with the Polish Forces, Walentynowicz stayed in London prior to the Normandy landings. The army had a quandary what to do with a Lieutenant who was a qualified architect, with insufficient knowledge of war craft. 'Make me a general', he suggested laconically and promptly was turned into a journalist. His war memoirs were published as Wojna bez patosu, War without pathos in 1969.