Sir Nicholas Slanning, 1st Baronet

Sir Nicholas Slanning, 1st Baronet FRS (June 1643 – April 1691) of Maristow in the parish of Tamerton Foliot, Devon, was an English courtier and politician who sat in the House of Commons between 1667 and 1689.

Life Slanning was the eldest son of Sir Nicholas Slanning and his wife Gertrude (née Bagge), daughter of Sir James Bagge. His father was killed in 1643 fighting for the Royalist cause in the Civil War. His mother remarried Richard Arundell, 1st Baron Arundell of Trerice.

After the Restoration of Charles II Slanning was knighted in 1661 and made a baronet in 1663. His first marriage to the influential Cartaret family brought him for a time into the inner Court circle. He was appointed Cupbearer to Queen Catherine of Braganza (1663) and Commissioner for Assessment for Cornwall (1661–1678), Devon (1661–1662, 1665–1680). He was elected a Fellow of the Royal Society in 1664. Like his father, he had some interest in chemistry.

In 1669, Slanning was elected Member of Parliament for Plympton Erle in the Cavalier Parliament. He was a diligent MP, sitting on some 70 committees. He was elected MP for Penrhyn in 1679 and in 1681 and 1685.