Koziołek Matołek (Silly the Billy-Goat) is a fictional character created by Kornel Makuszyński (story) and Marian Walentynowicz (art) in one of the first and most famous Polish comics back in 1933.

Once when Makuszyński and Walentynowicz were sitting in a coffee house in Kraków, they spotted a sad looking man sipping a drink at a nearby table.

The titular hero is nice, naive, clumsy, laughable and not very bright — in many regards similar to another famous children's story character, Winnie the Pooh by A.A. Milne.

The comic has influenced many generations of Poles, and some of its phrases have penetrated into the Polish language itself, with expressions like 'w Pacanowie kozy kują' (In Pacanów, they shoe goats), 'pacan' and 'matoł' (slowpoke, dummy).

From 1969 to 1971 an animated series Dziwne przygody Koziołka Matołka (Strange adventures of Koziołek Matołek) was made by Studio Miniatur Filmowych.