2025 Liga de Ascenso
The 2025 Primera B de Chile, also known as Liga de Ascenso Caixun 2025 due to sponsorship by electronics manufacturer Caixun, was the 71st season of the Primera B de Chile, Chile's second-tier football league. The regular season began on 21 February and ended on 2 November, with the second leg of the promotion play-off finals played as the final match of the season on 7 December 2025.
Universidad de Concepción were the champions, clinching their second Primera B title as well as promotion to the top flight with a 3–0 victory over Deportes Copiapó on 1 November, on the final matchday of the regular season. Deportes Concepción was the other team promoted to the Liga de Primera at the end of the season, after defeating Cobreloa in the promotion play-off finals.
Format
The competition was played under the same format used in the most recent seasons, with a regular stage and a play-off tournament. In the regular season, the 16 participating teams played each other in a double round-robin tournament for a total of 30 matches, with the top team at the end of the 30 rounds winning the championship as well as promotion to the Liga de Primera for the following season. The teams placing from second to eighth place at the end of the regular season entered the Liguilla to decide the second promoted team, in which the regular season runners-up received a bye to the semi-finals. The team placing last at the end of the regular season was relegated to Segunda División Profesional.Teams
The tournament was played by 16 teams, 13 of them returning from the previous season, two relegated from the 2024 Campeonato Nacional, and the 2024 Segunda División Profesional champions Deportes Concepción, who returned to the second tier after nine years following their disaffiliation from the ANFP in 2016. These teams replaced Deportes La Serena and Deportes Limache, who were promoted to the 2025 Liga de Primera, as well as Barnechea, relegated to Segunda División for this season.Deportes Concepción's promotion to Primera B was only confirmed on 31 January 2025, after a ruling by the Second Chamber of the Disciplinary Court upheld a three-point deduction for Deportes Melipilla in the 2024 Segunda División Profesional standings, leaving Deportes Concepción as Segunda División champions. Deportes Concepción were ratified as champions by the ANFP on 4 February, greenliting the club's participation in the competition.
Stadia and locations
;NotesStandings
Results
Promotion play-off
The teams placed from second to eighth place in the regular season played a knockout competition with the regular season runner-up getting a bye to the semi-finals. The winning side claimed the last promotion spot to the Liga de Primera for the next season.Bracket
Quarter-finals
Tied 4–4 on aggregate. Cobreloa won on penalties.----
San Marcos de Arica won 3–0 on aggregate.
----
''Deportes Concepción won 3–2 on aggregate.''
Semi-finals
Deportes Concepción won 2–1 on aggregate.----
''Cobreloa won 4–3 on aggregate.''