| Official Name: | Karlskär |
| Settlement Type: | Smaller locality |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location in Stockholm County |
| Subdivision Type: | Country |
| Subdivision Name: |  Sweden |
| Subdivision Type1: | County |
| Subdivision Name1: | Stockholm County |
| Subdivision Type2: | Municipality |
| Subdivision Name2: | Ekerö Municipality |
| Unit Pref: | Imperial |
| Population As Of: | 2005 |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Coordinates: | 59.4194°N 17.6589°W |
Karlskär is a village (smaller locality) on the Lake Mälaren island of Färingsö, Ekerö Municipality, Stockholm County, Sweden.[1]