| Tourney Name: | Big League World Series |
| Year: | 1970 |
| City: | Fort Lauderdale, Florida |
| Country: | United States |
| Num Teams: | 8 |
| Champion Other: | Lincolnwood, Illinois |
| Second Other: | San Fernando/Simi Valley, California |
| Prevseason: | 1969 |
| Nextseason: | 1971 |
The 1970 Big League World Series took place from August 17–22 in Fort Lauderdale, Florida, United States. Lincolnwood, Illinois defeated San Fernando/Simi Valley, California twice in the championship game. This was the first BLWS held in Fort Lauderdale.
This year marked the first appearance for the European, and Latin American regions.
| United States | International |
|---|---|
| Fort Lauderdale, Florida Host |  Thunder Bay, OntarioFort William Canada |
| New Hyde Park, New York East | Rhineland-Palatinate, West Germany Ramstein Air Base Europe |
| Lincolnwood, Illinois North |  San Juan, Puerto RicoLatin America |
| Charleston, West Virginia Charleston East South | |
| San Fernando/Simi Valley, California North Valleys West |