Lieutenant Colonel William Acton (1789 – 10 April 1854) was an Irish Conservative Party politician. Acton was educated at Trinity College, Dublin. He was elected at the 1841 general election as the Member of Parliament (MP) for Wicklow,having unsuccessfully contested the seat in 1832 and 1837. He was re-elected unopposed in 1847, but resigned the following yearby taking the Chiltern Hundreds.