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.
^(red) Association cantonale vaudoise de football. "FC Aigle" (in French). Association cantonale vaudoise de football - acvf.football.ch. Retrieved 2023-11-16.
^(red) Association fribourgeoise de football (2023). "FC Beauregard Fribourg" (in French). Association fribourgeoise de football - aff-ffv.ch. Retrieved 2023-11-16.
^(red) Walliser-Fussballverband (2023). "FC Bramois" (in French). Walliser-Fussballverband - avf-wfv.ch. Retrieved 2023-11-16.
^Association fribourgeoise de football (red) (2023). "FC Châtel-Saint-Denis" (in French). Association fribourgeoise de football - aff-ffv.ch. Retrieved 2023-11-16.
^(red) Association cantonale genevoise de football (2023). "FC Collex-Bossy" (in German). Association cantonale genevoise de football - acgf.ch. Retrieved 2023-11-16.
^(red) Association cantonale vaudoise de football (2023). "Concordia/Folgore Lausanne" (in German). Association cantonale vaudoise de football - acvf.football.ch. Retrieved 2023-11-16.
^(red) Association valaisanne de footbal (2023). "FC Fully" (in French). Association valaisanne de footbal - avf-wfv.ch. Retrieved 2023-11-16.
^Walliser Fussballverband (red) (2023). "FC Raron" (in German). Walliser Fussballverband - avf-wfv.ch. Retrieved 2023-11-16.
^(red) Association cantonale vaudoise de football (2023). "FC Renens" (in German). Association cantonale vaudoise de football - acvf.football.ch. Retrieved 2023-11-16.
^(red) Fussballverband Nordwestschweiz (2023). "FC Breitenbach" (in German). Fussballverband Nordwestschweiz - fvnws.ch. Retrieved 2023-11-16.
^(red) Association neuchâteloise de football (2023). "FC Boudry" (in French). Association neuchâteloise de football - anf.football.ch. Retrieved 2023-11-16.
^(red) Freiburger Fussballverband (2023). "FC Domdidier" (in German). Freiburger Fussballverband - aff-ffv.ch. Retrieved 2023-11-16.
^(red) Fussballverband Bern/Jura (2023). "FC Lerchenfeld" (in German). Fussballverband Bern/Jura - fvbj-afbj.ch. Retrieved 2023-11-16.
^(red) Association neuchâteloise de football (2023). "FC Le Locl" (in German). Association neuchâteloise de football - anf.football.ch. Retrieved 2023-11-16.