Tha Blue Herb is a Japanese alternative hip hop trio based in Sapporo, Hokkaido. They formed in 1997 and now consist of three members: Boss the MC a.k.a. Ill-Bosstino (MC), O.N.O. (producer, formerly live DJ until DJ Dye joined Tha Blue Herb in 1999) and DJ Dye (live DJ). They also run a record label called Tha Blue Herb Recordings.
James Hadfield of The Japan Times described Tha Blue Herb as "the Company Flow of Japanese hip-hop."
Beside releasing several albums and singles as the group, O.N.O. also released solo works, while Ill-Bosstino participated in Herbest Moon (with producer Wachall) and Japanese Synchro System (with producer Calm) and also worked with DJ Krush and Audio Active amongst others.