The title of Viscount Powerscourt has been created several times in the Peerage of Ireland, each time for members of the Wingfield family. It was created first in 1618, becoming extinct in 1634. It was created a second time in 1665, but became extinct in 1718. The most recent creation was in 1744.
The Viscount bears the subsidiary titles of Baron Wingfield (1744) in the Peerage of Ireland and Baron Powerscourt (1885) in the Peerage of the United Kingdom. Under the latter title, the Viscount sat in the House of Lords before 1999.
Viscounts Powerscourt, First Creation (1618)
- Richard Wingfield, 1st Viscount Powerscourt (1550-1634)
Viscounts Powerscourt, Second Creation (1665)
- Folliott Wingfield, 1st Viscount Powerscourt (1642-1717)
Viscounts Powerscourt, Third Creation (1744)
- Richard Wingfield, 1st Viscount Powerscourt (1697-1751)
- Edward Wingfield, 2nd Viscount Powerscourt (1729-1764)
- Richard Wingfield, 3rd Viscount Powerscourt (1730-1788)
- Richard Wingfield, 4th Viscount Powerscourt (1762-1809)
- Richard Wingfield, 5th Viscount Powerscourt (1790-1823)
- Richard Wingfield, 6th Viscount Powerscourt (1815-1844)
- Mervyn Wingfield, 7th Viscount Powerscourt (1836-1904)
- Mervyn Richard Wingfield, 8th Viscount Powerscourt (1880-1947)
- Mervyn Patrick Wingfield, 9th Viscount Powerscourt (1905-1973)
- Mervyn Niall Wingfield, 10th Viscount Powerscourt (b. 1935)
