Liga Nusantara (English: Archipelago League), officially known as PNM Liga Nusantara for sponsorship reasons, is the third-tier of the football competition system in Indonesia, organized by the Football Association of Indonesia (PSSI). The competition started in 2014 after PSSI merged the previous competitions, Liga Indonesia Second Division and Liga Indonesia Third Division. The competition was previously organized in two phases, with the provincial phase operated by PSSI Provincial Associations, where each province held its own regional competition, followed by the national phase operated by PSSI, where the top teams from each province competed at the national level.
Starting from the 2024–25 season, the competition is organized on a national level with teams divided into several groups based on geographical factors and is now operated by I-League.
The competition was established after Liga Indonesia Second Division and Liga Indonesia Third Division merged in 2014. Starting in 2015, the Liga Indonesia First Division was also merged with Liga Nusantara to become the third-tier level in Indonesian football system. Persatu Tuban won the competition's first season.
In 2017, Liga Nusantara was renamed to Liga 3, along with Indonesian Super League and Indonesian Premier Division which were renamed to Liga 1 and Liga 2, respectively.
In 2024, Liga 3 was renamed back to the Liga Nusantara, along with the establishment of Liga 4 as fourth-tier level. Liga Nusantara was elevated to a semi-professional level after previously being at the amateur level.