1981 Campeonato Nacional Segunda División
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The 1981 Segunda División de Chile was the 30th season of the Segunda División de Chile.
Deportes Arica was the tournament's champion.
Table
| Pos | Team | Pld | W | D | L | GF | GA | GD | Pts | Promotion or relegation |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Deportes Arica | 42 | 20 | 12 | 10 | 66 | 53 | +13 | 54 | Champions. Promoted to 1982 Primera División de Chile |
| 2 | Santiago Morning | 42 | 18 | 16 | 8 | 75 | 63 | +12 | 53 | Promoted to 1982 Primera División de Chile |
| 3 | Aviación | 42 | 20 | 12 | 10 | 68 | 42 | +26 | 52 | |
| 4 | Regional Atacama | 42 | 20 | 11 | 11 | 66 | 46 | +20 | 51 | |
| 5 | Rangers | 42 | 18 | 13 | 11 | 65 | 53 | +12 | 49 | 1981 Primera División de Chile promotion/relegation playoffs |
| 6 | Coquimbo Unido | 42 | 19 | 11 | 12 | 52 | 44 | +8 | 49 | |
| 7 | Deportes Antofagasta | 42 | 18 | 12 | 12 | 68 | 62 | +6 | 48 | |
| 8 | Linares Unido | 42 | 20 | 6 | 16 | 72 | 57 | +15 | 47 | |
| 9 | Trasandino | 42 | 19 | 7 | 16 | 56 | 52 | +4 | 46 | |
| 10 | Cobresal | 42 | 15 | 13 | 14 | 80 | 60 | +20 | 43 | |
| 11 | Huachipato | 42 | 16 | 11 | 15 | 71 | 59 | +12 | 43 | |
| 12 | Unión La Calera | 42 | 14 | 14 | 14 | 67 | 61 | +6 | 42 | |
| 13 | Talagante Ferro | 42 | 14 | 14 | 14 | 43 | 39 | +4 | 42 | |
| 14 | Lota Schwager | 42 | 15 | 12 | 15 | 48 | 52 | −4 | 42 | |
| 15 | Green Cross-Temuco | 42 | 12 | 14 | 16 | 50 | 54 | −4 | 38 | |
| 16 | Santiago Wanderers | 42 | 15 | 7 | 20 | 48 | 63 | −15 | 37 | |
| 17 | Iberia Biobío | 42 | 10 | 14 | 18 | 45 | 58 | −13 | 34 | |
| 18 | Deportes Ovalle | 42 | 12 | 10 | 20 | 42 | 56 | −14 | 34 | |
| 19 | Malleco Unido | 42 | 12 | 9 | 21 | 49 | 68 | −19 | 33 | |
| 20 | San Antonio Unido | 42 | 8 | 15 | 19 | 46 | 68 | −22 | 31 | |
| 21 | Deportes Colchagua | 42 | 7 | 17 | 18 | 40 | 77 | −37 | 31 | |
| 22 | Unión San Felipe | 42 | 8 | 14 | 20 | 45 | 75 | −30 | 30 | Relegated to 1982 Tercera División de Chile |