Kazimierz Wielikosielec is a Belarusian prelate of the Catholic Church and a Dominican. Since 1992, he has been the Vicar General and Dean of the Diocese of Pinsk deanery in Baranavichy, and since 1999 an auxiliary bishop of the Diocese of Pinsk. In January 2021, he was appointed Apostolic Administrator of the Archdiocese of Minsk–Mohilev.