2009–10 Croatian Second Football League

The 2009–10 Druga HNL (also known as 2. HNL) was the 19th season of Croatia's second level football competition since its establishment in 1992. Istra 1961 were league champions and were promoted to Prva HNL at the end of the previous season.

The league featured 14 clubs, playing in a double round robin league system. The season started on 22 August 2009 and ended on 29 May 2010.

Changes from last season
The following clubs have been promoted or relegated at the end of the 2008–09 season:

From 2. HNL
Promoted to 1. HNL
 * Istra 1961 (winners of 2008–09 2. HNL)
 * Karlovac (runners-up)
 * Lokomotiva (3rd placed team)
 * Međimurje (5th placed team)1

Relegated to 3. HNL
 * Trogir (last-placed team)2

To 2. HNL
Relegated from 1. HNL
 * None3

Promoted from 3. HNL
 * Lučko (3. HNL West runners-up)
 * Rudeš (3. HNL West winners)
 * RNK Split (3. HNL South winners)
 * Vukovar '91 (3. HNL East fourth place)

Clubs
(As of 9 July 2009, two out of the 16 clubs which were supposed to take part in 2. HNL failed to meet UEFA competition requirements and were refused licences. These were Zmaj Makarska and NK Đakovo.)

Top goalscorers
The top scorers in the 2009–10 Druga HNL season were: