Druga hrvatska nogometna liga sezone 2008./09. bila je 18. izdanje 2. HNL, a igrala se kao jedinstvena liga, kao i sezonu ranije. Predstavlja drugi stupanj nogometne lige u Hrvatskoj u sezoni 2008./09.

Novi drugoligaši su bili Međimurje (iz Prve HNL), te Lokomotiva, Suhopolje, Junak i Karlovac (iz 3. HNL).

Liga se sastoji od 16 momčadi. Igra se dvokružnim sustavom (30 kola). Prvak ostvaruje direktan plasman u 1. HNL.

Naslov prvaka osvojila je Istra 1961, a uz nju, u Prvu HNL izravno su se kvalificirali i Karlovac, Lokomotiva te Međimurje, nakon što je Slavonac odustao od prelaska u viši rang. U razigravanju, Hrvatski dragovoljac je poražen protiv posljednjeplasirane momčadi 1. HNL, Croatije Sesvete.

Iz 2. HNL relegiran je Trogir te Slavonac koji je relegiran u 1. ŽNL.

Momčadi

Imotski – Imotski Istra 1961 – Pula Junak – Sinj Karlovac – Karlovac Hrvatski dragovoljac – Zagreb Lokomotiva – Zagreb Međimurje – Čakovec Moslavina – Kutina Mosor – Žrnovnica Pomorac – Kostrena Segesta – Sisak Slavonac CO – Stari Perkovci Solin – Solin Suhopolje – Suhopolje Vinogradar – Jastrebarsko Trogir – Trogir

Ljestvica

Rezultati

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