Mats Olof Gustafsson (born 29 October 1964) is a Swedish free jazz saxophone player.

He later played widely with Peter Brötzmann, Joe McPhee, Paul Lovens, Barry Guy, Yoshimi P-We, Derek Bailey, Magnus Broo, Otomo Yoshihide, Pat Thomas, Jim O'Rourke, Thomas Lehn, Evan Parker, Misha Mengelberg, Oren Ambarchi, Zu, The Ex and Sonic Youth.

Since the early 1990s Gustafsson has been a regular visitor to the United States, forming a particular affinity with Chicago musicians Hamid Drake, Michael Zerang, and Ken Vandermark and recording for Okka Disk.

[1] Gustafsson has worked extensively with artists from the worlds of dance, theatre, poetry and painting.

This festival of musical improvisation is noted for its cross-genre character and creative atmosphere among musicians.