Nicholas III of Mecklenburg
Nicholas III of Mecklenburg (after 1230 – 8 June 1289 or 1290) was a younger son of John I the Theologian and an ecclesiastic: in 1266 he became canon of Lübeck Cathedral and from 1269 served as a priest in Wismar.
When his brother Henry I the Pilgrim was captured on pilgrimage, Nicholas and his brother John II acted as regents for Henry's underage sons. He is last attested in 1289.