IDEC may refer to:
Biogen Idec, a biotechnology company IDEC Corporation, a Japanese manufacturer of automation and control products International Democratic Education Conference, an annual academic and youth conference Toralizumab (IDEC 131), an antibody and an immunosuppressive drug IDEC Sport Racing, a French auto racing team The sponsor name given to ocean racing trimarans skippered by French yachtsman Francis Joyon: , a 75ft trimaran built in 1985 IDEC 2, a 97ft trimaran built in 2007 IDEC 3, a 103ft trimaran built in 2006