Sir Roger Mostyn, 3rd Baronet

Sir Roger Mostyn, 3rd Baronet (31 July 1673 – 5 May 1739) was a Welsh politician.

Mostyn was born on 31 July 1673, in Flintshire, north Wales. He was the eldest son of Sir Thomas Mostyn, 2nd Baronet, of Mostyn and Bridget, daughter and heiress of Darcy Savage, esq., of Leighton, Cheshire, He inherited the title on the death of his father in 1692. He attended the University of Oxford, matriculating at Jesus College on l0 February 1689-90.

He was appointed Sheriff of Caernarvonshire for 1701 and elected as MP for Flintshire in December 1701. In August 1702, he was elected MP for Flint and for Cheshire, choosing to represent Cheshire. He then alternated between representing Flint and Flintshire until his retirement in 1734. He was Constable of Flint Castle for two periods, from 1702 to 1705, and then from 1715 to 1728. He was also Custos Rotulorum of Flintshire from 1714 to 1717, and from 1727 until his death in 1739.

He was a Tory and a supporter of Daniel Finch, 2nd Earl of Nottingham. In 1711, he was appointed paymaster of the marines, and was one of the four tellers of the exchequer from 30 December 1714 until 22 June 1716. He voted for tacking on the Occasional Conformity Bill to the Land-tax Bill in 1705, and against the articles of commerce in 1713. He voted against the Peerage Bill in 1719, and Walpole's excise scheme in 1733, and having opposed the Septennial Bill, supported the motion for its repeal in 1734. In consideration of his services and the expenses he incurred as paymaster of the marines, he was allowed a sum of £300 for eight years. There is also among the 'Treasury Papers' a dormant warrant in favour of Mostyn as controller of the fines for the counties of Chester, Flint, and Carnarvon, dated 31 July 1704.

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