John McClintock, 1st Baron Rathdonnell

John McClintock, 1st Baron Rathdonnell (26 August 1798 – 17 May 1879), was an Irish Conservative peer and Member of Parliament.

On 21 December 1868 he was raised to the Peerage of Ireland as Baron Rathdonnell, of Rathdonnell in the County of Donegal, with remainder to the male issue of his deceased younger brother Captain William McClintock-Bunbury.

Lord Rathdonnell was married to Anne Lefroy, sister of Sir John Henry Lefroy, and they lived between Drumcar, County Louth, and their London house at 80 Chester Square.

Rathdonnell was also an uncle of the Arctic explorer Sir Francis Leopold McClintock.

He was succeeded in the Barony according to the special remainder by his nephew Thomas McClintock-Bunbury, who notably served as Lord Lieutenant of County Carlow and as President of the Royal Dublin Society.