Jonas Kullhammar (September 2, 1978 in Nacka, Sweden) is a Swedish jazz composer, saxophonist and is one of Sweden's most established jazz musicians.
Since 1998 his main group has been Jonas Kullhammar Quartet, and he has participated on over 150 records as a sideman. In year 2000 he released his debut recording, the self-produced "Salut". It won him Sweden Radio's Jazz Cat award as the newcomer of the year. He also received the Django D'or award and received the price Sweden Radio's Jazz Cat as Jazz Musician of The Year in Sweden two years in a row. The group also received the award for jazz group of the year