  Integrated quantum light source is increasingly desirable in large-scale
quantum information processing.~Despite recent remarkable advances, new
material platform is constantly being explored for the fully on-chip
integration of quantum light generation, active and passive manipulation, and
detection. Here, for the first time, we demonstrate a gallium nitride (GaN)
microring based quantum light generation in the telecom C-band, which has
potential towards the monolithic integration of quantum light source.~In our
demonstration, the GaN microring has a free spectral range of 330 GHz and a
near-zero anomalous dispersion region of over 100 nm. The generation of
energy-time entangled photon pair is demonstrated with a typical raw two-photon
interference visibility of 95.5$\pm$6.5%, which is further configured to
generate heralded single photon with a typical heralded second-order
auto-correlation $g^{(2)}_{H}(0)$ of 0.045$\pm$0.001. Our results pave the way
for developing chip-scale quantum photonic circuit.
