Olefin
Olef is the name of:
- Olef (Schleiden) , part of Schleiden in the Euskirchen district, North Rhine-Westphalia
- Olef (river) , tributary of the Urft in Blumenthal, municipality of Hellenthal, district of Euskirchen, North Rhine-Westphalia
Olef is a family name that may refer to:
- Ingrid Olef (* 1939), German politician