Mikołaj Sówka z Gulczewa (of Prawdzic coat of arms), also known as Nicholas was fourteenth century bishop of Płock in Poland who held office from 10 December 1365 to 1367AD. He came from Gulczewa near Płock, was a canon of Płock Cathedral during the reign of Bishop . and with his brother Stanislaus, worked in the office of the king. He received regal support and on 7 August 1365, was selected by the cathedral chapter as head of the diocese. To secure succession Mikołaj went to Avignon and was appointed a bishop by pope Urban V and consecrated on 13 December 1365 by Cardinal Elijah, Bishop of Ostia.