The 2025 2. deild karla (English: Men's Second Division) was the 60th season of third-tier Icelandic football.
The league consisted of twelve teams; eight teams remaining from the previous season, two teams promoted from the 3. deild karla, and two teams relegated from the 1. deild karla.
The promoted teams were the 2024 3. deild karla champions Kári and runners-up VÃÂðir. They replaced the 2024 2. deild karla bottom two teams KF and Reynir.
The relegated teams were the 2024 1. deild karla bottom two teams DalvÃÂk/Reynir and Grótta. They replaced the 2024 2. deild karla champions Selfoss and runners-up Völsungur.
Each team plays each other twice (22 matches each), once at home and once away.