Supercapacitors have become promising energy storage devices owing to their high power density and fast charging capability. Herein, we synthesized GaN nanowires coated with MoS2 nanosheets on graphite paper by chemical vapor deposition and explored their electrochemical properties. Both GaN nanowire and MoS2-coated GaN composite nanowire electrodes exhibit Faradaic behaviors from redox reactions. The MoS2-coated GaN composite nanowire electrodes show enhanced electrochemical activities with a capacity of 173.4 mC cm‒2 at 1 mA cm‒2. Thin MoS2 nanosheets are quasi-perpendicularly grown onto the GaN nanowire surface, which prevents their aggregation. The coupling of MoS2 nanosheets with GaN nanowire enables a high surface area and provides channels to facilitate ion diffusion. In this work, we demonstrate the GaN–MoS2 composite nanowires as potential flexible battery-type electrode materials in wearable electronics and sustainable energy applications.