| Tournament details | |
|---|---|
| Country | Cuba |
| Venue(s) | 1 (in 1 host city) |
| Dates | 14 September – 6 October |
| Teams | 7 |
| Final positions | |
| Champions |  Cuba (2nd title) |
| Tournament statistics | |
| Games played | 84 |
| MVP | Connie Marrero |
The 1940 Amateur World Series was the third Amateur World Series (AWS), an international men's amateur baseball tournament. The tournament was sanctioned by the International Baseball Federation (which titled it the Baseball World Cup as of the 1988 tournament). The tournament took place, for the second consecutive time, in Cuba. It was contested by seven national teams playing twelve games each from September 14 through October 6 in Havana.
Cuba won its second, and second consecutive, Amateur World Series title. The runners-up were, also for the second consecutive year, Nicaragua and the United States; though the U.S. had finished in third place in 1939, the 1940 tournament saw a marked improvement as it tied with Nicaragua for the silver medal.