The 1978 Amateur World Series was the 25th 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 in Italy, only the second time outside the Americas, from 25 August to 6 September, and was won by Cuba – its 15th AWS victory.

1978 Amateur World Series

Tournament details
Country	Italy
Dates	25 August – 6 September
Teams	11
Final positions
Champions	Cuba (15th title)
Runner-up	United States
Third place	South Korea
Fourth place	Japan

There were 11 participating countries, including first-time participants Belgium and Australia.