Van Gaal got off to a poor start in his first season but Bayern turned things around to win the Bundesliga title.
As well as the Bundesliga title, Bayern won the DFB-Pokal with a 4-0 victory over Werder Bremen.
Van Gaal promoted youth players, like Thomas Muller and Holger Badstuber, while also converting winger Bastian Schweinsteiger.
Van Gaal was voted Manager of the Year by the German PFA.
Karl-Heinz Rummenigge expressed his desire to extend Van Gaal's contract after a successful first campaign in charge.