Frederick Trench (British Army officer)

General Sir Frederick William Trench KCH (c. 1777 – 6 December 1859), was a British soldier and Tory politician.

Trench was the son of Michael Frederick Trench, a barrister and amateur architect, of Heywood, only son of Reverend Frederick Trench, of Ballinakill, in Queen's County (now County Laois). His mother was Anne Helena, daughter and heiress of Patrick Stewart, second son of James Stewart, of Killymoon, County Tyrone. The Earls of Clancarty were members of another branch of the Trench family.

Trench served in the British Army. He also sat as Member of Parliament for Mitchell between 1806 and 1807, for Dundalk between February and October 1812, for Cambridge between 1819 and 1832 and for Scarborough between 1835 and 1847. In 1829 he was appointed Storekeeper of the Ordnance, a post he held until 1831. He was promoted to General in 1846.