Patrick Moncreiff (c.1674–1709), of Reidie and Myres Castle, Fife, was a Scottish politician who sat in the Parliament of Scotland from 1706to 1707 and in the British House of Commonsfrom 1707 to1709.
Moncreiff was the second, but eldest surviving son. of George Moncreiff, of Reidie and Myres Castle and his wifeMargaret Leslie, daughter of John Leslie of Myres Castle. In 1694 he became a lieutenant inLord John Murray’snewly formed regimentof Foot and was thencaptain from 1695 until the regiment was disbanded in 1697. He studied at Leyden in 1698, aged 24.He returnedto Scotland, and was admitted as an advocate in 1701. He became aBurgess of Edinburgh in 1702 and on 1 March 1702, married Anna or Agnes Skene, widow of James Skene of Grange and Kirkcaldy, Fife, and daughter of John Drummond of Cultmalundie, Perth. She died before 7 April 1720.
Moncreiff was returned tothe Scottish parliament as Burgh Commissionerfor Kinghorn on 18 June 1706.He supported the Court over the Union and was said to be under the influence of the Earl of Leven. Moncreiff was a courtier and on that basis was selected as one of the Scottish representatives to the first Parliament of Great Britain in 1707 Hespoke on behalf ofthe Court in the debates on the abolition of the Scottish privy council in December 1707, and was complimented on the quality of his speeches.. In March 1708 hebecame a captain and lieutenant-colonelin the Scots Foot Guards.
Atthe 1708 British general election, Moncreiff was returned in a fierce contest asMember of Parliament for Fife.
Moncreiff died in London on or shortly before 20 January 1709 leaving a son and daughter.