Sir William Montgomery, 1st Baronet (9 November 1717 – 25 December 1788) was a Scottish-born politician in Ireland.
Montgomery was born in Scotland, the son of William Montgomery of Magbie Hill in Ayrshire.[1] His family was a cadet branch of the Earls of Eglinton. Montgomery migrated to Dublin, where he prospered as a contractor for the Irish Army. He married firstly Hannah, the daughter of Alexander Tomkins of County Londonderry, by whom he had a son, William (died 1777) and three daughters (Elizabeth, Anne and Barbara), Elizabeth Gardiner, Viscountess Mountjoy married Luke Gardiner, 1st Viscount Mountjoy and Anne Townshend, Marchioness Townshend married George Townshend, 1st Marquess Townshend . He married secondly Anne Evatt, daughter of Humphrey Evatt of County Monaghan.[1]
In 1768 he was elected to the Irish House of Commons as a member of parliament for Ballynakil. He continued to represent the seat until his death in 1788.[2] On 28 May 1774, Montgomery was made a baronet, of Magbie Hill in the Baronetage of Great Britain. Upon his death he was succeeded in his title by his only son by his second wife, George Montgomery.[3]