1989–90 Swiss 1. Liga

The '''1989–90 Swiss 1. Liga''' was the 58th season of this league since its creation in 1931. At this time, the 1. Liga was the third tier of the Swiss football league system and it was the highest level of amateur football.

Format
There were 56 clubs in the 1. Liga, divided into four regional groups, each with 14 teams. Within each group, the teams would play a double round-robin to decide their league position. Two points were awarded for a win. The four group winners and the four runners-up then contested a play-off for the three promotion slots. The two last placed teams in each group were directly relegated to the 2. Liga (fourth tier). The four third-last placed teams would compete a play-out against the ninth relegation spot.

Qualification round
 Urania Genève Sport win 2–0 on aggregate and continue to the finals.

 Concordia/Folgore Lausanne win 2–0 on aggregate and continue to the finals.

 SC Burgdorf win 4–1 on aggregate and continue to the finals.

 SC Kriens win 3–2 on aggregate and continue to the finals.

Final round
 SC Burgdorf win 6–3 on aggregate and are promoted to Nationalliga B. 

 Urania Genève Sport win 7–4 on aggregate and are promoted to Nationalliga B. 

Decider for third place
The play-off for the third promotion place was played on 16 June 1990 in Châtel-St-Denis.

 Concordia/Folgore Lausanne win, but refused promotion, so SC Kriens are promoted to Nationalliga B. 

Decider for championship
The play-off for the 1. Liga championship was played on 16 June 1990 in Châtel-St-Denis.

'' Urania Genève Sport win and become 1. Liga champions.''

First round
FC Raron continue to the final.

FC Vaduz continue to the final.

Final round
'' FC Raron win 4–3 on aggregate and remain in the division. FC Vaduz are relegated to 2. Liga. ''

Further in Swiss football

 * 1989–90 Nationalliga A
 * 1989–90 Nationalliga B
 * 1989–90 Swiss Cup