Inchtuthil (known to the Romans as Pinnata Castra (meaning "Fortress on the wing") and Victoria) is the site of a Roman legionary fortress situated on a natural platform overlooking the north bank of the River Tay southwest of Blairgowrie, Perth and Kinross, Scotland.

Built in 82 or 83 CE as the advance headquarters for the forces of Agricola in his campaign against the Caledonian tribes, and positioned at the head of one of the main routes in and out of the Scottish Highlands, it is occupied by Legion XX Valeria Victrix and covers a total area of 21.5 hectares (fifty-three acres).

Construction of the large fortress will have taken two or three seasons and a temporary camp is built nearby to house and protect the soldiers over the winter.

Additional, smaller forts are built further north and south at the mouth of each nearby glen forming what are now referred to as the Glenblocker forts.