Catherine Grandison, Countess of Salisbury

Catherine Grandison (c. 1304-1349) was an English noblewoman, daughter of William de Grandison, 1st Baron Grandison. Around 1320 she married William Montagu, the future 1st Earl of Salisbury.

The chronicler Jean le Bel claimed Edward III assaulted her at Wark Castle in 1341, though modern scholars regard the story as French propaganda. She may also be the countess whose dropped garter inspired Edward III to found the Order of the Garter around 1348. She died in November 1349.