2025 3. deild karla
The 2025 3. deild karla was the 71th season of fourth-tier Icelandic football. The season began on 3 May and finished on 13 September 2025.
The title winners and runners-up were promoted to the 2026 2. deild karla, whilst the bottom two teams were relegated to the 2026 4. deild karla.
Teams
The league consisted of twelve teams; eight teams remaining from the previous season, two teams promoted from the 4. deild karla, and two teams relegated from the 2. deild karla.The promoted teams were 2024 4. deild karla champions Tindastóll and runners-up IH. The relegated teams were 2024 2. deild karla bottom two teams KF and Reynir.