William Saunders Sebright Lascelles PC (29 October 1798 – 2 July 1851) was a British Whig politician.

Lascelles was the third son of Henry Lascelles, 2nd Earl of Harewood and his wife Henrietta Sebright, daughter of Lieutenant-General Sir John Sebright, 6th Baronet.

Lascelles was returned to Parliament for East Looe in 1826, a seat he held until 1830.

[4] In 1847 he was sworn of the Privy Council[5] and appointed Comptroller of the Household under Lord John Russell,[6] a post he held until his death in 1851.

He is recorded in one match for E. H. Budd's XI, totalling 1 run with a highest score of 1.