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We report the discovery and characterisation of a giant transiting planetorbiting a nearby M3.5V dwarf (d = 80.4 pc, $G$ = 15.1 mag, $K$=11.2 mag,R$_\star$ = 0.358 $\pm$ 0.015 R$_\odot$, M$_\star$ = 0.340 $\pm$ 0.009M$_\odot$). Using the photometric time series from TESS sectors 10, 36, 46, and63 and near-infrared spectrophotometry from ExTrA, we measured a planetaryradius of 0.77 $\pm$ 0.03 R$_J$ and an orbital period of 1.52 days. Withhigh-resolution spectroscopy taken by the CFHT/SPIRou and ESO/ESPRESSOspectrographs, we refined the host star parameters ([Fe/H] = 0.27 $\pm$ 0.12)and measured the mass of the planet (0.273 $\pm$ 0.006 M$_J$). Based on thesemeasurements, TOI-4860 b joins the small set of massive planets ($>$80 M$_E$)found around mid to late M dwarfs ($<$0.4 R$_\odot$), providing both aninteresting challenge to planet formation theory and a favourable target forfurther atmospheric studies with transmission spectroscopy. We identified anadditional signal in the radial velocity data that we attribute to an eccentricplanet candidate ($e=0.66\pm0.09$) with an orbital period of $427\pm7$~days anda minimum mass of $1.66\pm 0.26$ M$_J$, but additional data would be needed toconfirm this.

TOI-4860 b, a short-period giant planet transiting an M3.5 dwarf