Sir John Robert Mowbray, 1st Baronet PC (3 June 1815 – 22 April 1899), known as John Cornish until 1847, was a British Conservative politician and long-serving Member of Parliament, eventually serving as Father of the House.

Mowbray was the son of Robert Stirling Cornish and was educated at Westminster School and Christ Church, Oxford.

The same year he assumed by royal licence the surname Mowbray in lieu of his patronymic to reflect the large fortune into which he married.

They had three sons, all of whom succeeded to their father's baronetcy, and two daughters:[1] In 1853 Mowbray was elected to the House of Commons for Durham, a seat he held until 1868, and then represented Oxford University from 1868 until his death in 1899.

[1] A bronze bust was erected as a memorial in the House of Commons in 1900.