Ulick John de Burgh, 1st Marquess of Clanricarde KP PC (English: /ˈjuːlɪk dəˈbɜːr ... klænˈrɪkɑːrd/ YOO-lik də-BUR ... klan-RIK-ard; 20 December 1802 – 10 April 1874), styled Lord Dunkellin (/dʌnˈkɛlɪn/ dun-KEL-in) until 1808 and the Earl of Clanricarde from 1808 until 1825, was a British Whig politician who served as British Ambassador to Russia (1838–40), Postmaster General (1846–52) and Lord Keeper of the Privy Seal (1858).

In January 1826 the Earl of Liverpool appointed him as Joint Under-Secretary of State for Foreign Affairs (alongside Lord Howard de Walden), a post he held until August of the same year.

A supporter of the British Whigs and a sitting member of the Russell Ministry, his principal aim was upholding the interests of the Anglo-Irish landowning class.

He suggested state-sponsored public works and land drainage and sought to have corn depots set up in Loughrea and Portumna to distribute food.

Clanricarde also financially assisted the emigration of poor tenants; this issue is controversial due to the fact that it still meant the displacement of the native population from the land, but supporters argue that it would have at least saved more lives (Charles Trevelyan opposed such programmes).

The couple had seven children: Lord Clanricarde died at Stratton Street, Piccadilly, London, in April 1874, aged 71, and was succeeded in the marquessate by his second but only surviving son, Hubert.