The Fussball Club Basel 18931983–84 season was their 90th season since the club was founded. It was their 38th consecutive season in the top flight of Swiss football after they won promotion during the season 1945–46. They played their home games in the St. Jakob Stadium. Urs Gribi was thier newly apponted chairman, he replaced Roland Rasi who stood down at the AGM after just one year chairmanship.
Ernst August Künnecke was the first team manager. He had taken over from Rainer Ohlhauser, who had been manager for just one year. Basel played in the 1983–84 Nationalliga A. Basel ended the season in ninth position, 16 points behind Grasshopper Club Zürich who became champions for the second consequetive year. In their 30 league games Basel won eleven matches, drew six and lost thirteen. Basel obtained 28 points, scored 55 and conceeding 59 goals.
Basel entered into the Swiss Cup in the round of 64 and here they were drawn away against local lower league club FC Birsfelden. The match was a one sided affair and Basel won 8–0. In the round of 32 they had a home fixture against Luzern but were beaten 0–3. The cup season was beended for Basel because the Swiss League Cup was not competed this year and because they were not qualified for european competitions, nor did they enter the Coppa delle Alpi.