Galway are the first team to book their place in the All-Ireland Minor Football Championship final.
The Tribesmen survived a late Derry surge to run out 2-9 to 1-11 winners at Parnell Park.
Jack Lonergan and Colm Costello with the goals for the Westerners, while Eoin Higgins rattled the net for Derry.
Mayo play Kerry in the other semi-final in Tullamore at 2:45pm.