Frederick Trench, 2nd Baron Ashtown

Frederick Mason Trench, 2nd Baron Ashtown DL (25 December 1804 – 12 September 1880) was an Irish peer and magistrate.

Early life He was son of Francis Trench and his wife Mary Mason, second daughter of Henry Mason, and nephew to Frederick Trench, 1st Baron Ashtown.

Career While his claim to his uncle's title was admitted only in 1855, he actually succeeded per special remainder on the latter's death in 1840. and represented the county as Deputy Lieutenant.

Personal life On 29 August 1831, he married firstly Harriet Georgiana Cosby, youngest daughter of Thomas Cosby, of Stradbally Hall and his wife Charlotte Elizabeth Kelly (daughter of Rt. Hon. Thomas Kelly, Second Justice of the Common Pleas of Ireland). Together, they were the parents of two daughters and three sons, including:

Hon. Charlotte Elizabeth Trench (1832–1854), who died unmarried. Frederick was the older brother of her brother's wife Lady Anne.

Trench died, aged 75, at Clonodfoy (otherwise known as Castle Oliver) and was buried at the family's mausoleum at Woodlawn, County Galway, a week later.