| Competition: | Segunda División |
| Season: | 1970 |
| Winners: | Unión San Felipe |
| Promoted: | Unión San Felipe |
| Relegated: | Municipal de Santiago |
| League Topscorer: | Ricardo Rojas Moya (25 goals) Unión San Felipe |
| Prevseason: | 1969 |
| Nextseason: | 1971 |
The 1970 Segunda División de Chile was the 19th season of the Segunda División de Chile.
Unión San Felipe was the tournament's champion.[1]