Dorothea Lady Knighton (1780–1862) was an artist who wrote the Memoirs of Sir William Knighton, Bart, GCH, Keeper of the Privy Purse during the reign of His Majesty King George the Fourth. Including his correspondence with many distinguished persons (1838). She married William Knighton, who would become surgeon to King George IV and executor of his will. She had four children, two daughters and two sons. Her eldest child, a son, died in infancy.