Thomas Lyon (1741-1796), was a Scottish politician who sat in the House of Commons between 1768 and 1778.
Lyon was the third son of Thomas Lyon, 8th Earl of Strathmore and Kinghorne and Jean Nicholson, daughter of James Nicholson of West Rainton, co. Durham. He matriculated at Pembroke College, Cambridge in 1758 and was awarded MA in 1761. He was a Fellow of the university from 1761 to 1763. 
Lyon’s father had been MP for Forfar in 1734 which was subsequently held by William Maule. In 1768 the Strathmore family put Lyon forward to take back the seat of Forfar from the Panmure family. Lyon also stood as Member of Parliament for Aberdeen Burghs. After an exhausting struggle Panmure was returned for the Forfar and Lyon for Aberdeen Burghs. As a result, the Strathmore and Panmure families made an agreement to avoid future contests. Lyon was re-elected in MP for Aberdeen Burghs in 1774.  He married Mary Elizabeth Wren, daughter of Farren Wren of Binchester, co. Durham on 13 June 1774. 
Lyon’s brother John the 9th Earl died in 1776 and Lyon as sole surviving uncle and one of the guardians of the Strathmore children became deeply involved in financial and legal business. He succeeded his mother to the Hetton-le-Hole estate in Durham on 22 April 1778 and vacated his seat at the opening of the autumn session of 1778.  Lyon and his son John believed there was good coal under the Hetton estate and carried out prospecting from the 1770s.  Lyon died on 13 September 1796. 
Earl of Strathmore and Kinghorne is a title in the Peerage of Scotland and the Peerage of the United Kingdom. It was first created as Earl of Kinghorne in the Peerage of Scotland in 1606 for Patrick Lyon. In 1677, the designation of the earldom changed to "Strathmore and Kinghorne". A second earldom was bestowed on the 14th Earl in the Peerage of the United Kingdom in 1937, leading to him being titled as the 14th and 1st Earl of Strathmore and Kinghorne.
Field Marshal John Campbell, 5th Duke of Argyll, styled Marquess of Lorne from 1761 to 1770, was a Scottish soldier and nobleman. After serving as a junior officer in Flanders during the War of the Austrian Succession, he was given command of a regiment and was redeployed to Scotland where he opposed the Jacobites at Loch Fyne at an early stage of the Jacobite Rebellion and went on to fight against them at the Battle of Falkirk Muir and then at the Battle of Culloden. He later became adjutant-general in Ireland and spent some 20 years as a Member of Parliament before retiring to Inveraray Castle.
Lord Frederick Campbell was a Scottish nobleman and politician. He was Lord Clerk Register of Scotland, 1768–1816; Member of Parliament (MP) for Glasgow Burghs (1761–1780) and for Argyllshire (1780–1799).
Thomas Lyon, 8th Earl of Strathmore was a Scottish nobleman, and Tory politician who sat in the House of Commons from 1734 to 1735, when he resigned upon succeeding to the peerage as Earl of Strathmore.
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John Bowes, 9th Earl of Strathmore and Kinghorne, born John Lyon, was a Scottish nobleman and peer. He was the 9th Earl of Strathmore and Kinghorne and one of the ancestors of Queen Elizabeth II.
John Maule, of Inverkeilor, Forfarshire, was a Scottish Whig politician who sat in the British House of Commons from 1739 to 1748.
Thomas or Tom Lyon may refer to:
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