The 2018–19 Croatian Second Football League (also known as Druga HNL and 2. HNL) was the 28th season of the Croatian Second Football League, the second-level football competition for men's association football teams in Croatia, since its establishment in 1992. The season started on 24 August 2018 and ended in May 2019. The league is contested by 14 teams and played in a double round robin format, with each team playing every other team twice over 26 rounds.