| Competition: | Primera B de Chile |
| Season: | 2018 |
| Dates: | 2 February – 1 December 2018 |
| Winners: | Coquimbo Unido (3rd title) |
| Promoted: | Coquimbo Unido Cobresal |
| Relegated: | San Marcos de Arica |
| League Topscorer: | Rodrigo Holgado (18 goals) |
| Matches: | 248 |
| Total Goals: | 620 |
| Biggest Home Win: | Cobreloa 6–0 Melipilla (12 August) |
| Biggest Away Win: | (11 November) |
| Highest Scoring: | San Marcos 2–5 Copiapó (17 February) Copiapó 4–3 S. Wanderers (18 March) U. San Felipe 4–3 Coquimbo Unido (6 October) |
| Prevseason: | 2017 |
| Nextseason: | 2019 |
The 2018 Primera B de Chile, known as the 2018 Campeonato Loto for sponsorship purposes, was the 65th season of Chile's second-tier football league. The competition began on 2 February 2018 and ended on 1 December 2018.[1] Coquimbo Unido were the champions.
The tournament was played by 16 teams which played each other twice (once at home and once away), for a total of 30 matches. The team that finished in first place at the end of the round-robin tournament earned promotion to the Campeonato Nacional for the 2019 season. Meanwhile, the teams finishing from second to sixth place played in a playoff tournament for the second promotion berth, with the season runners-up having a bye to the final. The team finishing in bottom place at the end of the season was relegated to the Segunda División Profesional.[2]
----Santiago Wanderers won 6–1 on aggregate.Cobresal won 4–3 on aggregate.
----Cobresal won 4–3 on aggregate.
----Cobresal won 4–3 on aggregate and earned promotion to the Primera División.
| Rank | Name | Club | Goals | |
|---|---|---|---|---|
| align=center | 1 |  Rodrigo Holgado | Coquimbo Unido | 18 |
| align=center | 2 | Lucas Simón | Cobreloa | 17 |
| align=center | 3 | Gustavo Lanaro | Deportes Valdivia | 13 |
| 4 | Ever Cantero | Cobresal | 12 | |
| Enzo Gutiérrez | Santiago Wanderers | |||
| Miguel Orellana | Barnechea | |||
| 7 |  Reiner Castro | Santiago Wanderers | 10 | |
| Germán Estigarribia | Deportes Copiapó | |||
| Gonzalo Sosa | Magallanes | |||
| 10 | Óscar Ortega | Santiago Morning | 8 | |
| Stefan Pino | Deportes Melipilla | |||
| Mathias Pinto | Deportes Melipilla |
Source: Soccerway