Henry David Erskine, 10th Earl of Buchan, FRS (17 April 1710 – 1 December 1767), styled Lord Auchterhouse until 1745, was a Scottish peer.

[2] Lord Buchan married Agnes, daughter of Sir James Steuart, 7th Baronet, on 31 January 1739.

His elder daughter was Lady Anne Agnes Erskine who was involved with the evangelical Methodists of Countess of Huntingdon's Connexion.

[3] They had five other children: Lord Buchan died at Walcot, Somerset, on 1 December 1767, aged 57, and his funeral was conducted by George Whitefield.

The Countess of Buchan died at Edinburgh, Scotland, in December 1778, aged 61.