Robert de Clifford, 1st Baron de Clifford, English soldier and politician, Lord Warden of the Marches (born 1274)

Robert de Clifford, 1st Baron de Clifford, of Appleby Castle, Westmorland, feudal baron of Appleby and feudal baron of Skipton in Yorkshire, was an English soldier who became 1st Lord Warden of the Marches, responsible for defending the English border with Scotland.

The Lord Warden of the Marches was an office in the governments of Scotland and England. The holders were responsible for the security of the border between the two nations, and often took part in military action. They were also responsible, along with Conservators of the Truce, for administering the special type of border law known as March law.