Sir Walter Richard Nugent, 4th Baronet (12 December 1865 – 12 November 1955) was an Irish baronet, politician and member of parliament (MP) in the House of Commons from 1907 to 1918.
Nugent was elected unopposed to the House of Commons as an Irish Parliamentary Party MP for South Westmeath at a by-election in 1907, and held the seat through the January and December 1910 elections, until 1918. At the 1918 general election, he ran as an independent nationalist candidate in the Westmeath constituency but was defeated by Sinn Féin's Laurence Ginnell.
In 1896, he had succeeded to the baronetcy of Donore in Multyfarnham, County Westmeath. He was a member of Seanad Éireann of the Irish Free State from 1928 to 1931.
He was the last High Sheriff of Westmeath in 1922.