John Singleton Copley, 1st Baron Lyndhurst, PC, QS, FRS (21 May 1772 – 12 October 1863) was a British lawyer and politician.

Lyndhurst was born in Boston, Massachusetts, the son of painter John Singleton Copley and his wife Susanna Farnham (née Clarke), granddaughter of silversmith Edward Winslow.

Lyndhurst's performance attracted the attention of Lord Castlereagh and other Tory leaders, and he entered parliament as member for Yarmouth in the Isle of Wight.

As he was in regard to Catholic emancipation, so in the agitation against the Corn Laws, he opposed reform until Peel, his chief, gave the signal for concession.

[4] After 1846 and the disintegration of the Tory party over Peel's adoption of free trade, Lord Lyndhurst did not attend parliament sessions as often, but he continued to take a lively interest in public affairs and to make speeches.

[2] He died in London on 12 October 1863 and was buried in Highgate Cemetery;[7] as he left no son, his peerage became extinct.