Sir John Gell, 1st Baronet (22 June 1593 – 26 October 1671) was a Parliamentarian politician and military figure in the English Civil War.
He was born to Thomas Gell and Millicent Sacheverell in Hopton Hall in Derbyshire His father owned a large estate in the Wirksworth area, largely based on extensive interest in the lead industry, which included possession of the lead tithes in the mines of Bakewell, Hope and Tideswell and smelting and mine owning in Wirksworth. His father died shortly before the birth of a second son in 1594 and his mother married John Curzon, of Kedleston Hall, soon afterwards. Millicent gave birth to a son, John, in 1598.Until his return to Hopton in 1620, Gell lived with his mother and stepfather at Kedleston. This proved significant to his later political career as he formed a close relationship with his half-brother, John Curzon, who became an influential Member of Parliament (MP). Gell was married in January 1609, at the age of 15, to Elizabeth Willoughby, daughter of Sir Percival Willoughby of Wollaton Hall in Nottinghamshire.
In 1624 Gell was appointed captain of foot in the trained bands, or militia, in the hundreds (administrative areas) of High Peak and Scarsdale. During a decade or more as a militia captain Gell learned how the military was organised in Derbyshire. He became familiar with the rank and file and their officers and with the minutiae of training and command. This knowledge and expertise was soon to be put to use.