| Achtrup | |
| German Name: | Agtrup / Åktoorp |
| Image Coa: | DEU Achtrup COA.svg |
| Coordinates: | 54.7833°N 11°W |
| Image Plan: | Achtrup in NF.PNG |
| State: | Schleswig-Holstein |
| District: | Nordfriesland |
| Amt: | Südtondern |
| Elevation: | 22 |
| Area: | 29.90 |
| Postal Code: | 25917 |
| Area Code: | 04662 |
| Licence: | NF |
| Gemeindeschlüssel: | 01 0 54 001 |
| Mayor: | Hannelore Schulze |
Achtrup (Danish: Agtrup; North Frisian: Åktoorp) is a municipality in Nordfriesland district, in Schleswig-Holstein in northern Germany.
Besides standard German, Low German and South Jutlandic, a Danish dialect, are still spoken in the area.