The 2018–19 NK Istra 1961 season was the club's 58th season in existence and the 10th consecutive season in the top flight of Croatian football. Additionally, it was the first season under ownership of Spanish Baskonia - Alavés Group.[2]
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: PrvaHNL.hr 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).[37] (O) Play-off winners; (R) Relegated