The 2023–24 NK Osijek season was the club's 110th season in existence and the 33rd consecutive season in the top flight of Croatian football. This was the first season for Osijek to play their home matches on the newly built Opus Arena.[1]
Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply. Players may hold more than one non-FIFA nationality.
Source: SuperSport HNL Rules for classification: 1) Points; 2) Head-to-head points; 3) Head-to-head goal difference; 4) Head-to-head goals scored (at home if two teams tied); 5) Goal difference; 6) Goals scored; 7) Play-off (Note: Criteria 2-4 and 7 is only used if deciding champion, teams to international competition or teams for relegation and in that case criteria 6 will not be used).[41] Notes:
^The 2023–24 Croatian Football Cup winners qualified for the Europa League second qualifying round. Since the cup winners (Dinamo Zagreb) qualified based on league position, the Europa League spot was passed to the second-placed team, and the second Conference League second qualifying round spot was passed to the fourth-placed team.