Mateusz Cierniak (born on 3 October 2002) is an international speedway rider from Poland.
[1][2] In 2021, Cierniak finished second in the Krosno round of the World Under 21 Championship.
He was denied the chance to compete for the title itself after only being allowed to compete in one of the three rounds because he was not listed as one of the original qualified riders.
[7] He won a gold medal at the 2024 European Under 23 Team Speedway Championship for the fifth time.
[8] Also in 2024, he helped Lejonen win the Elitserien during the 2024 Swedish speedway season[9] and helped Lublin win the Ekstraliga during the 2024 Polish speedway season.