Mieszko of Bytom (b. ca. 1305 – d. bef. 9 August 1344), was a Duke of Siewierz during 1312–1328 (from 1315 only formally), Bishop of Nitra 1328–1334 and Bishop of Veszprém from 1334 to his death. He was the fifth and youngest son of Duke Casimir of Bytom by his wife Helena.