Kazimierz Wielikosielec (, Kazimir Vialikaselets; 5 May 1945 â 8 February 2026) was a Belarusian prelate of the Catholic Church and a Dominican. From 1992, he was the Vicar General and Dean of the Diocese of Pinsk deanery in Baranavichy, and from 1999 an auxiliary bishop of the Diocese of Pinsk. In January 2021, he was appointed Apostolic Administrator of the Archdiocese of MinskâÂÂMohilev.
Vialikaselets was born in the village Staravolia, Pruzhany District on 5 May 1945. In 1981, he was admitted to the seminary in Riga. While studying at the seminary, he joined the Order of Dominican Fathers. After graduating from the seminary in 1984, Vialikaselets was ordained a priest by Cardinal Julijans Vaivods and was directed to his first parish of the Holy Trinity in Ishkaldz, Brest Region, Belarus. Because in those days priests were lacking, he also oversaw Catholic parishes in several neighbouring villages located in Hrodna Region and Minsk Region. In addition to the pastoral ministry, Father Vialikaselets dealt with the reconstruction and renovation of temples.
In 1992 he was appointed Vicar General of the Diocese of Pinsk, while performing duties of dean of the Baranavichy Deconate and pastor of the Church of the Holy Cross in Baranavichy.
On 24 June 1999, Vialikaselets was consecrated Bishop at the Cathedral of Pinsk by Cardinal Kazimir Sviontak.
On 3 January 2021, Vialikasieliets was appointed Apostolic Administrator of the Roman Catholic Archdiocese of MinskâÂÂMohilev following the resignation of Archbishop Tadevush Kandrusevich.
Vialikaselets retired on 10 October 2024, and died on 8 February 2026, at the age of 80.