The 2025 Besta deild karla was the 114th season of top-flight Icelandic Football. It was the fourth season following the league's rebrand as Besta deild karla.
The league consisted of twelve teams: the top ten teams from the previous season, and two teams promoted from the 1. deild karla. Breiðablik entered the season as defending champions after winning their seventh title during the previous season.
The promoted teams were the 2024 1. deild karla champions ÃÂBV (promoted after a single-season absence), and play-off winners Afturelding (promoted to the top division for the first time in their history). They replaced the 2024 Besta deild karla bottom two teams, HK and Fylkir.
Promoted to the Besta deild
Relegated to the 1. deild
Team played each other twice (once at home and once away) for a total of 22 games each.
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Teams play each other once for the third time (either at home or away) for a total of 5 games each.
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Teams play each other once for the third time (either at home or away) for a total of 5 games each.