Lt.-Col. Charles St Clair, 13th Lord Sinclair (30 July 1768 – 30 September 1863) was a Scottish noble and representative peer.
[2] His paternal grandfather was Charles St Clair, de jure 11th Lord Sinclair (a son of Dr. Matthew St Clair, who was a younger brother of John Sinclair, 23rd Lord Herdmanston).
[3] His maternal grandparents were John Rutherfurd, MP for Roxburghshire, and Eleanor (née Elliot) Rutherfurd (a daughter of the Lord Justice Clerk Sir Gilbert Elliot, 2nd Baronet, of Minto).
[4] His claim to the Lordship of Sinclair was confirmed by the House of Lords on 25 April 1782.
Together, they were the parents of:[8] Lord Sinclair died on 30 September 1863 and was succeeded in the lordship by his eldest son James.