Baron Louth is a title in the Peerage of Ireland. It has been created twice.
It was created secondly in 1541 for Sir Oliver Plunkett. His great-great-great-grandson, the seventh Baron, served as Lord Lieutenant of County Louth. However, he later supported King James II and was outlawed. His great-great-grandson, the eleventh Baron, managed to obtain a reversal of the outlawry and was restored to the title. As of 2014 the title is held by the latter's great-great-great-great-grandson, the seventeenth Baron, who succeeded his father in 2013.
Barons Louth, first creation (c.1458)
- Thomas Bathe, 1st Baron Louth (died 1478)
Barons Louth , second creation (1541)
- Oliver Plunkett, 1st Baron Louth (died 1555)
- Thomas Plunkett, 2nd Baron Louth (c. 1547–1571)
- Patrick Plunkett, 3rd Baron Louth (1548–1575)
- Oliver Plunkett, 4th Baron Louth (died 1607)
- Matthew Plunkett, 5th Baron Louth (died 1629)
- Oliver Plunkett, 6th Baron Louth (1608–1679)
- Matthew Plunkett, 7th Baron Louth (died 1689) (outlawed)
- Oliver Plunkett, ''de jure'' 8th Baron Louth (1668–1707)
- Matthew Plunkett, de jure 9th Baron Louth (1698–1754)
- Oliver Plunkett, ''de jure'' 10th Baron Louth (1727–1763)
- Thomas Oliver Plunkett, 11th Baron Louth (1757–1823) (restored to title)
- Thomas Oliver Plunkett, 12th Baron Louth (1809–1849)
- Randal Percy Otway Plunkett, 13th Baron Louth (1832–1883)
- Randal Pilgrim Ralph Plunkett, 14th Baron Louth (1868–1941)
- Otway Randal Percy Oliver Plunkett, 15th Baron Louth (1892–1950)
- Otway Michael James Oliver Plunkett, 16th Baron Louth (1929–2013)
- Jonathan Oliver Plunkett, 17th Baron Louth (born 1952)
The heir apparent is the present holder's son Hon. Matthew Oliver Plunkett (born 1982).
- "Telegraph Announcements – Lord Louth". The Daily Telegraph (London). Retrieved 11 January 2013.
- Kidd, Charles, Williamson, David (editors). Debrett's Peerage and Baronetage (1990 edition). New York: St Martin's Press, 1990.
- Leigh Rayment's Peerage Pages [self-published source][better source needed]
- Louth Papers