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Johan Slager (born 8 June 1946, Amsterdam) is a Dutch musician best known as the original guitarist of rock band Kayak. ^[1] He co-founded the band along with Ton Scherpenzeel, Pim Koopman, and Max Werner in 1972. He left the band in 1982 after nine albums, and returned briefly for a couple of performances in the 1990s. When Kayak reunited in 1999, Johan was replaced by Rob Winter.

During and after his time with Kayak, Slager played with many Dutch artists; he played on albums by Circus Custers, Bolland & Bolland and Ekseption, and formed his own band called Plus Doreen. His guitar sounds can also be heard on albums by his ex-Kayak mates Max Werner and Edward Reekers. In recent years, he has joined singer Michel van Dijk ( Alquin). Together with befriended musicians they play in Dutch pubs, doing mostly covers ( Rolling Stones, Bob Dylan, The Band, etc.).