Solid-state defects susceptible of spin manipulation hold great promise for scalable quantum technology. To broaden their utility, operation at room temperature and emission in the telecom wavelength range are desired, eliminating cryogenic requirements and leveraging existing optical fiber infrastructure for the transmission of quantum information. To that end, we report that telecom single-photon emitters (SPEs) in gallium nitride (GaN) exhibit optically detected magnetic resonance (ODMR) at room temperature. The analysis of ODMR as a function of magnetic field orientation enables the determination of the orientation of the spin quantization axis with respect to the GaN crystalline lattice. The optical transitions dynamics are analyzed to gain further insight into the transition rates dominating ODMR. Our findings, coupled with the mature fabrication technology of GaNs, could facilitate the realization of scalable quantum technology.