The feudal barony of Appleby (or Honour of Appleby) was a feudal barony with its caput at Appleby Castle in Appleby, Westmorland, England.
The barony was formed from lands formerly controlled in the 12th century by the feudal barons of Burgh-by-Sands (alias "Brough") in Cumberland, namely the families successively of de Trevers, Engaine, de Morville and de Lucy.
Following the acquisition of the whole of the feudal barony of Appleby by Robert de Clifford, 1st Baron de Clifford (1274–1314), it descended thenceforth in the Clifford family, together with the feudal barony of Skipton and the barony by writ of de Clifford.