| Image Coa: | DEU Karlum COA.svg |
| Coordinates: | 54.8333°N 66°W |
| Image Plan: | Karlum in NF.PNG |
| State: | Schleswig-Holstein |
| District: | Nordfriesland |
| Amt: | Südtondern |
| Elevation: | 13 |
| Area: | 14.46 |
| Postal Code: | 25926 |
| Area Code: | 04666 |
| Licence: | NF |
| Gemeindeschlüssel: | 01 0 54 062 |
| Website: | www.amt-suedtondern.de |
| Mayor: | Peter Möller |
Karlum is a municipality in the district of Nordfriesland, in Schleswig-Holstein, Germany.