J.J. is a name used by more than one act. One listed J.J. is the Swedish duo Jan Johnston and Tony Kirkhan, who release material under the name jj. They issue four singles and one album, Intro, and the singles named are “If I Never See Sunday,” “Slide Away,” “If This Is Love” and “Crying Over You.” Some of these singles include acoustic and a cappella performances on the B-sides. Jan Johnston provides the vocals and Tony Kirkhan plays guitar.

J.J. is also used by an alternative R&B artist from New Jersey. In addition, the name is associated with Johan Jensen and Southside House Collective.