Sir Francis Blake Delaval KB (16 March 1727 – 7 August 1771) was a British actor, soldier and Member of Parliament.

He had a privileged and aristocratic education at Westminster School, Eton College and then Christ Church at Oxford University.

He took part in the Raid on St Malo, and received a knighthood for his bravery when storming the Brittany beach, although there were no French troops present to offer resistance.

His wife filed a lawsuit against him because of adultery with an actress, Miss La Roche, for which Isabella unknowingly forked out £1500.

He suffered a stroke, and was memorialized by his obituarist as "'the very soul of frolic and amusement (who) overbalanced a few foibles by a thousand amiable qualities".