The 2019–20 Croatian Second Football League (also known as Druga HNL and 2. HNL) was the 29th 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 16 August 2019 and ended on 6 May 2020. The league is contested by 16 teams and played in a double round robin format, with each team playing every other team twice over 30 rounds.