Jan (Janne) Erik Tage Schaffer (born September 24, 1945 in Stockholm, Sweden) is a Swedish songwriter and guitarist. He is best known for his work as a session guitarist for ABBA, but he has also recorded with artists such as Bob Marley, Johnny Nash, Art Farmer and Tony Williams. He also played at the 1977 Montreux Jazz Festival. His 1979 album Earmeal included session work from brothers Jeff, Steve and Mike Porcaro, as well as their father, Joe Porcaro. This is most likely the only known instance where the entire Porcaro family appears together on one album.

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