Sydney William Herbert Pierrepont, 3rd Earl Manvers (12 March 1826 – 16 January 1900) was a British hereditary peer and politician.

He was educated at Eton, entered Christ Church, Oxford in 1843 and received his BA in 1846.

While at Oxford, Pierrepont was commissioned a first lieutenant in the Nottinghamshire Yeomanry Cavalry (Sherwood Rangers) in 1844.

[1] In 1852, Pierrepont was elected unopposed as Conservative Member of Parliament for South Nottinghamshire.

They had five children:[3] Lord Manvers died in January 1900 at the age of 73 at Thoresby Hall from bronchitis after having influenza.