| Official Name: | Boo |
| Pushpin Map: | Sweden Stockholm#Sweden |
| Subdivision Type: | Country |
| Subdivision Name: | Sweden |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Nacka Municipality |
| Subdivision Type2: | County |
| Subdivision Name2: | Stockholm County |
| Subdivision Type1: | Province |
| Subdivision Name1: | Uppland |
| Area Footnotes: | [1] |
| Area Total Km2: | 16.26 |
| Population As Of: | 31 December 2010 |
| Population Total: | 24,052 |
| Population Density Km2: | 1479 |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Coordinates: | 59.3167°N 33°W |
Boo, sometimes referred to as Saltsjö-Boo, is a locality situated on the island of Värmdö in Sweden's Stockholm archipelago. From an administrative perspective, it is located in Nacka Municipality and Stockholm County, and has 24,052 inhabitants as of 2010.
Boo was an independent municipality until 1970. In 1971 it was integrated into Nacka Municipality.
The following sports clubs are located in Boo: