Frederick Oliver Trench, 3rd Baron Ashtown (2 February 1868 – 20 March 1946) was an Anglo-Irish landowner and opponent of the United Irish League.

[2] He was a hard-line Unionist; in 1906–10 he edited a monthly publication, Grievances from Ireland, which denounced all political expressions of Irish nationalism as treasonable.

His hunting lodge at Ballymacarbry, County Waterford, was damaged by bombs and arson in 1907 and destroyed by the Irish Republican Army during the War of Independence.

He and Arthur Maxwell, 11th Baron Farnham, received an equal number of votes, with his name ultimately drawn from a glass in according with the procedures of the House.

[5] According to the Dictionary of Irish Biography, the assaults were of a sexual nature, although Ashtown justified them as a "misunderstanding of his habit of slapping people on the knee or back while talking to them".