1990-91 Austrian Nationalliga season

The 1990-91 Austrian Nationalliga season was contested as the second-level competition in Austria. EK Zell am See won the championship. They earned promotion to the Austrian Hockey League.

Quarterfinals

 * EK Zell am See (2) - EC Graz (7): 2:0 (10:1, 6:3)
 * EC Kitzbühel (3) - EC Stadlau (6): 2:0 (12:1, 9:4)
 * EHC Linz (5) - SV Kapfenberg (4): 2:0 (4:2, 4:3)

Semifinals

 * EK Zell am See (2) - EC Kitzbühel (3): 2:0 (9:5, 6:3)
 * EHC Lustenau (1) - EHC Linz (5): 0:2 (7:9, 1:5)

Final

 * EHC Linz (5) - EK Zell am See (2): 0:2 (0:2, 2:3)