John William Henry Dalrymple, 7th Earl of Stair (16 November 1784 – 22 March 1840) was the son of General William Dalrymple and Marianne Dorothy Harland.
He incurred great scandal over his complicated marital life.
Dalrymple subsequently denied any legal relationship with Johanna; Judge William Scott (later Lord Stowell) upheld the validity of the marriage under Scots law in the famous 1811 case of Dalrymple v. Dalrymple.
In the meantime, though, in 1808, Dalrymple married Laura Manners, daughter of John Manners (a Member of Parliament and grandson of the 2nd Duke of Rutland) and Lady Louisa Tollemache (later 7th Countess of Dysart).
Dalrymple died on 22 March 1840, aged 55, in Paris without issue and was succeeded by a cousin.