Michael Watterson (born April 3, 2004), professionally known as Ja66 (pronounced Jagg), is an American artist based in New York.

He is known on Soundcloud for his close work with frequent collaborators kushbabykeys and yuke, both of whom are prevalent in the underground music community.

Ja66 is commonly associated with his manager Henry Kava, where he has appeared on his Youtube channel. Kava also uses his status to publicise and promote Ja66’s music to his 260,000 followers on TikTok.