11 August is the 223rd day of the year (224th in leap years). There are 142 days remaining until the end of the year.
- 1981: Ginevra Weasley is born to Arthur Weasley and Molly Weasley (née Prewett). She is the first girl born to the Weasley family in several generations. She is the younger sister of six boys.
- 1995: A goblin stockbroker loses a lot of Galleons on the potions market.