Bilsam Aviation Industries Sp. z o.o. is a Polish aircraft manufacturer based in Poznań. The company specializes in the design and manufacture of ultralight aircraft in the form of plans and kits for amateur construction and ready-to-fly aircraft for the US FAR 103 Ultralight Vehicles rules, the European Fédération Aéronautique Internationale microlight and US light sport aircraft categories. The company also designs and builds its own aircraft engines. The company is organized as a Spółka z ograniczoną odpowiedzialnością, a Polish limited liability company.