1965-66 NLA season

The 1965-66 NLA season was the twenty-sixth season of the Nationalliga A.

Playoffs
Grasshopper Club won the championship.

No Relegation Playoffs

Neuchatel Young Sprinters, the champion of the Nationalliga B, is promoted to the Nationalliga A for 1966-67. HC Villars is demoted to the Nationalliga B for 1966-67.