Sackville Walter Lane-Fox (24 March 1797 – 18 August 1874), was a British Conservative Party politician.
Lane-Fox was the son of James Fox-Lane, of Bramham Park, Yorkshire, by the Honourable Mary Lucy, daughter of George Pitt, 1st Baron Rivers. He was the brother of George Lane-Fox and the uncle of Augustus Pitt Rivers.
Lane-Fox was returned to parliament as one of two representatives for Helston in 1831. He became the sole representative after the Great Reform Act of 1832 reduced the constituency to one seat. He lost the seat in 1835 and remained out of the House of Commons until 1840, when he was returned for Beverley. He only held the seat until 1841 but returned to parliament the following year as one of two representatives for Ipswich. In 1847 he was once again elected for Beverley, a seat he held until 1852.
Lane-Fox married Lady Charlotte Mary Anne Georgiana, daughter of George Osborne, 6th Duke of Leeds, in 1826. She died in January 1836, aged 44.
On the death of Elizabeth Catherine, land that had been leased (between 1836 and 1843) on the lives of three of Lane-Fox's children, by his cousin Francis D'Arcy-Osborne, 7th Duke of Leeds, returned to the ownership of the Duke of Leeds. The land, centred in west Cornwall, mainly in the parishes of Breage, Camborne, Germoe, Ludgvan, St Erth and Wendron brought income of approximately £5,000 to the Duke of Leeds.