Mariusz Okoniewski (born February 10, 1956 in Poznań, Poland - death February 10, 2006 in Śmigiel, Poland) was a Polish motorcycle speedway rider who was won Team Speedway Polish Championship six times and Polish Silver Helmet in 1976. His son Rafał (b. 1980) is a speedway rider also. Rafał is only double Individual U-19 European Champion. Mariusz Okoniewski died on his 50th birthday.