Nicholas, Lord of Rostock, nicknamed the child (before 1262 – 25 November 1314) was a member of the House of Mecklenburg.
His elder brothers John and Henry Borwin died before 1285, so that he became the sole ruler, initially under the regency of his mother.
After several failed attempts by the Lord of Mecklenburg and Werle, the other two Lordships ruled by the House of Mecklenburg, to conquer Rostock, he put his territory under the protection and feudal overlordship of King Eric VI of Denmark.
In a peace treaty between Henry II and King Christopher II of Denmark signed on 21 May 1323, Henry was given the Lordships of Rostock, Gnoien and Schwaan as hereditary Danish fiefs and Rostock ceased to exist as a separate principality.
In 1299, he eventually married Margaret, the daughter of Duke Bogislaw IV of Pomerania-Wolgast (d. 14 January 1316).