| Season: | 1985–86 |
| Competition: | Nationalliga A |
| Winners: | Young Boys |
| Relegated: | Grenchen Baden |
| League Topscorer: | Steen Thychosen Lausanne-Sport (21 goals) |
| Prevseason: | 1984–85 |
| Nextseason: | 1986–87 |
| Season: | 1985–86 |
| Competition: | Nationalliga B |
| Winners: | FC Locarno |
| Promoted: | FC Locarno AC Bellinzona |
| Relegated: | FC Zug FC Laufen FC Le Locle |
| League Topscorer: | Wolfgang Vöge Lugano (29 goals) |
| Prevseason: | 1984–85 |
| Nextseason: | 1986–87 |
Statistics of the Swiss National League in the 1985–86 football season, both Nationalliga A and Nationalliga B. This was the 89th season of top-tier Swiss football.
There were 32 member clubs in the Swiss Football Association (ASF/SFV), divided into two tiers of 16 teams each. The top tier was named Nationalliga A (NLA) and the second tier was named Nationalliga B (NLB). In both divisions the teams played a double round-robin to decide their table positions. The Swiss champions would qualify for the 1986–87 European Cup, the runners-up and third placed team would qualify for the 1986–87 UEFA Cup. The last two placed teams in the NLA would be directly relegated to the NLB for the following season. The top two placed teams in the NLB would be promoted to the top tier. The last three teams in the NLB would be relegated to next season's 1. Liga.[1]
The first round was played on 7 August 1985. There was to be a winter break between 23 November and 2 March 1986. The season was completed on 27 May 1987.
The first round was played on 3 August 1985. There was to be a winter break between 24 November and 2 March 1986. The season was completed on 28 May 1986.