Adrianus Cornelis “Adrie” Koster (Dutch pronunciation: [?dri'ja?n?s k?r'ne?l?s '?dri 'k?st?r]; born 18 November 1954 in Zierikzee, Zeeland) is a Dutch football manager who is currently the manager of Willem II.
He is a former football winger from the Netherlands and former manager of AFC Ajax, Club Brugge and the Netherlands Under-21 team.