Prince Frederick William of Great Britain (13 May 1750 – 29 December 1765) was a grandchild of King George II and the youngest brother of King George III.

He was the youngest son of Frederick, Prince of Wales and Princess Augusta of Saxe-Gotha.

His father was Frederick, Prince of Wales, eldest son of George II and Caroline of Ansbach.

He was christened on 17 June of the same year,[1] at the same house, by the Bishop of Oxford, Thomas Secker.

[3] Frederick was posthumously granted the arms of the kingdom differenced by a label argent of five points, the centre bearing a fleur-de-lys azure, the other points each bearing a rose gules.