Baron Grandison was a title that was created twice in the Peerage of England

Peerage of England

The Peerage of England comprises all peerages created in the Kingdom of England before the Act of Union in 1707. In that year, the Peerages of England and Scotland were replaced by one Peerage of Great Britain....

, both times for men, Sir Otho de Grandison

Otton de Grandson

Otto de Grandson was a medieval Savoyard knight long in the service of the English crown under Edward I. He was the closest personal friend of Edward, his exact contemporary, and shared the king's many interests....

 and William de Grandison, who were summoned to Parliament in 1299. The barony created for Sir Otho became extinct on his death in circa 1305. The barony created for William fell into abeyance

Abeyance

Abeyance is a state of expectancy in respect of property, titles or office, when the right to them is not vested in any one person, but awaits the appearance or determination of the true owner. In law, the term abeyance can only be applied to such future estates as have not yet vested or possibly...

 on the death of the fourth Baron in 1375.

Barons Grandison (1299)

• Otho de Grandison
  Otton de Grandson
  Otto de Grandson was a medieval Savoyard knight long in the service of the English crown under Edward I. He was the closest personal friend of Edward, his exact contemporary, and shared the king's many interests....
  
  , 1st Baron Grandison (d. c. 1305)

Barons Grandison (1299)

• William de Grandison, 1st Baron Grandison (d. 1330)
• Peter de Grandison, 2nd Baron Grandison (1295–1358)
• John de Grandison, 3rd Baron Grandison (1292–1369)
• Thomas de Grandison, 4th Baron Grandison (1339–1375) (abeyant)