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We report the discovery of TOI-530b, a transiting giant planet around anM0.5V dwarf, delivered by the Transiting Exoplanet Survey Satellite (TESS). Thehost star is located at a distance of $147.7\pm0.6$ pc with a radius of$R_{\ast}=0.54\pm0.03\ R_{\odot}$ and a mass of $M_{\ast}=0.53\pm0.02\M_{\odot}$. We verify the planetary nature of the transit signals by combiningground-based multi-wavelength photometry, high resolution spectroscopy fromSPIRou as well as high-angular-resolution imaging. With $V=15.4$ mag, TOI-530bis orbiting one of the faintest stars accessible by ground-based spectroscopy.Our model reveals that TOI-530b has a radius of $0.83\pm0.05\ R_{J}$ and a massof $0.4\pm0.1\ M_{J}$ on a 6.39-d orbit. TOI-530b is the sixth transiting giantplanet hosted by an M-type star, which is predicted to be infrequent accordingto core accretion theory, making it a valuable object to further study theformation and migration history of similar planets. We discuss the potentialformation channel of such systems.

TOI-530b: A giant planet transiting an M dwarf detected by TESS