The 1986–87 Swiss 1. Liga was the 55th 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. Due to a modification in the Nationalliga B (second tier), an increase in the number of teams in the following season, there were to be four direct promotions from the 1. Liga. In the first stage of the play-offs, the four group winners contested a play-off final against one of the four runners-up for the four direct promotion slots. Then in the second stage, the four defeated teams would contest a play-off final against the four last placed teams from the Nationalliga B to decide the last four places in the second tier in the next year. At the other end of the league table the situation was much clearer, the two last placed teams in each group were directly relegated to the 2. Liga (fourth tier).
^(red) Association cantonale vaudoise de football. "FC Aigle" (in French). Association cantonale vaudoise de football - acvf.football.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 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 football (2023). "FC Leytron" (in French). Association valaisanne de football. Retrieved 2023-11-16.
^Ville de Genève (2023). "Centre sportif de Varembé" [Varembé Sports Center] (in French). geneve.ch. Retrieved 2023-11-16.
^(red) Association valaisanne de football (2023). "FC Savièse" (in French). Association valaisanne de football - avf-wfv.ch. Retrieved 2023-11-16.
^(red) Association cantonale genevoise de football (2023). "FC Vernier" (in French). Association cantonale genevoise de football. Retrieved 2023-11-16.
^(red) Fussballverband Nordwestschweiz (2023). "FC Breitenbach" (in German). Fussballverband Nordwestschweiz - fvnws.ch. Retrieved 2023-11-16.
^Fussballverband Bern/Jura (2023). "FC Dürrenast" (in German). Fussballverband Bern/Jura. Retrieved 2023-11-16.
^(red) Fussballverband Bern/Jura (2023). "FC Köniz" (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.
^Fussballverband Bern/Jura (2023). "FC Lengnau" (in German). Fussballverband Bern/Jura. Retrieved 2023-11-16.
^(red) Fussballverband Bern/Jura (2023). "FC Moutier" (in German). Fussballverband Bern/Jura - fvbj-afbj.ch. Retrieved 2023-11-16.
^(red) Innerschweizerischer Fussballverband (2023). "FC Altdorf" (in German). Innerschweizerischer Fussballverband. Retrieved 2023-11-16.
^(red) Amateur Liga (2023). "FC Ascona" (in German). Amateur Liga - al-la.ch. Retrieved 2023-11-16.