Coningsby Sibthorp DCL (c. 1706 – 20 July 1779) was an English Tory politician who sat in the House of Commons for the borough seat of Lincoln variously between 1741 and 1768.

[6] Sibthorp's father briefly enjoyed a political career, first appearing as a co-presenter at court of a High Tory address from Lincolnshire.

The elder Sibthorp made little impact in the Commons and did not put his name forward for re-election in 1715, though this may have been due to the pro-Whig political climate.

[9] Sibthorp himself would inherit considerable property from his wealthy unmarried uncle in Lincolnshire and Nottinghamshire, in addition to a house in North Mymms called Skimpans.

[15] The Whig interest enjoyed an edge in local politics until 1727 when Tory Charles Hall, a kinsman of Sibthorp, successfully contested a seat.

At the 1734 general election Hall stood down for Sibthorp who invested considerable amounts of money to win the seat.

[17] Sibthorp was victorious as one of the two candidates elected for the borough with Charles Monson, defeating the nephew of a South Sea Company director handily.

At the subsequent general election Sibthorp was defeated by the interest of the Tyrwhitt family who had aligned with the Whigs, a gain against national trends.

[18] Sibthorp's victory in Lincoln was certainly assisted by the support of Opposition Whigs such as Scarbrough and Sir Francis Dashwood.

The sheer cost and competitive nature of elections in Lincoln was alluded to by Lord Monson in a letter to the Prime Minister, the Duke of Newcastle in May 1758: "It is not in my power any longer to support or even maintain the interest I so dearly bought at the last general election in Lincoln (by the desire of Mr. Pelham, more than my own inclination) if your Grace will not think of me ; and that the spending £7,000 and upwards exclusive of my house being like a fair for two years should not have intitled (sic) me to some small favour before this, I own I think hard.

[21] Some opposition was mounted at the last moment by the eccentric Thomas Scrope, who stood as a candidate of "the free and independent voters" but was defeated by Sibthorp and a member of the Monson family, resulting in a riot.

[29] Sibthorp is not recorded as having made a single speech in the House of Commons during his many years of service, though he does appear to have had a healthy attendance rate.

[32] During the remainder of his final term in office Sibthorp voted against the repeal of the Stamp Act and opposed the government's proposed land ta in February 1767.