Its official name is Collegium Sanctae Mariae prope Wintoniam ( or Collegium Beatae Mariae Wintoniensis prope Winton ) , or St Mary 's College near Winchester . The school is commonly just called `` Winchester '' . Officially known as Collegium Sanctae Mariae prope Wintoniam ( or Collegium Beatae Mariae Wintoniensis prope Winton ) , or St Mary 's College near Winchester , the school is sometimes referred to by pupils , former pupils and others as `` Win : Coll : '' , and is more widely referred to as just `` Winchester '' .