Which king was Queen Victoria's paternal grandfather?

Queen Victoria’s paternal grandfather was King George III.

Victoria’s father was Prince Edward, Duke of Kent and Strathearn, the fourth son of George III and Queen Charlotte. That made George III Victoria’s paternal grandfather, while Charlotte was her paternal grandmother.

George III ruled from 1760 until his death in 1820, a remarkably long reign that included the American Revolutionary War, the French Revolutionary and Napoleonic eras, and the Acts of Union that created the United Kingdom of Great Britain and Ireland in 1801.

The chronology can cause confusion because George III died in the same year as Victoria’s father, Edward. Victoria was only eight months old when Edward died, and she succeeded her uncle William IV in 1837. George IV and William IV were therefore Victoria’s uncles, not her grandfather; George II belonged to the earlier generation.