| Competition: | Primera División |
| Season: | 1940 |
| Winners: | Boca Juniors (10th title) |
| Promoted: | Banfield |
| Relegated: | Vélez Sársfield Chacarita Juniors |
| Continentalcup1: | 1940 Copa Aldao |
| Continentalcup1 Qualifiers: | Boca Juniors |
| League Topscorer: | D. Benítez C. (Boca Juniors) Isidro Lángara (S. Lorenzo) (33 goals each) |
| Prevseason: | 1939 |
| Nextseason: | 1941 |
The 1940 Argentine Primera División was the 49th season of top-flight football in Argentina. The season began on April 7 and ended on December 22.[1]
With 18 teams competing in the tournament, Boca Juniors achieved its 10th league title. Banfield returned to Primera while Vélez Sársfield and Chacarita Juniors were relegated.