G.Addict is a seiyuu-singing unit from seiyuu who roles in Goulart Knights. The members are Yuki Kaji, Atsushi Abe, Takuma Terashima, and Kazuma Horie.

G.Addict released 2 singles, 1 mini album (debut), and 1 full album (final) between December 9, 2014 to February 23, 2011.

1st Live DVD "G.Addict LIVE Sign of Addiction '11 LIVE DVD" was released on 3rd Anniversary (September 26, 2011).