Delfinen (Swedish for dolphins) may refer to:
- HSwMS Delfinen, various Swedish Navy ships
- Delfinen-class submarine, a Royal Danish Navy class
- HDMS Delfinen (S326), the lead ship of the class, launched in 1956
- Delfinen , a Swedish royal barge constructed in 1787; see List of oldest surviving ships
- Coop Norrbotten Arena, Luleå, Sweden, an indoor sporting arena originally named Delfinen
- Delfinen, the student newspaper of Aarhus University, Aarhus, Denmark