Nathaniel Clements, 2nd Earl of Leitrim, KP (May 9, 1768) - (December 31, 1854) was an Irish nobleman. Born in Dublin, he was educated at a private school in Portarlington and Oriel College, Oxford, graduating in 1788. Two years later he was elected to the Irish House of Commons as Whig member for Carrick, and in 1797, as Viscount Clements, he was elected for County Leitrim, holding the same seat at Westminster from 1801 to 1804.

Having served as Sheriff of County Leitrim in 1796, Clements that same year became Colonel of the Donegal Regiment until its disbandment in 1802. Two years later, he succeeded his father as 2nd Earl of Leitrim, but subsequently failed in his attempts to be elected to the House of Lords as an Irish representative peer. In 1831, as well as becoming Lord Lieutenant for County Leitrim, Lord Leitrim was created Baron Clements in the Peerage of the United Kingdom. Three years later he was appointed a Knight of the Order of St Patrick, and later that year he became a member of the Irish Privy Council.

Lord Leitrim died in 1854 aged 86 at his residence of Killadoon in County Kildare. His eldest son having predeceased him in 1839, he was succeeded in the earldom by his younger son, William Sydney Clements.