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The imminent launch of space telescopes designed to probe the atmospheres ofexoplanets has prompted new efforts to prioritise the thousands of transitingplanet candidates for follow-up characterisation. We report the detection andconfirmation of TOI-1842b, a warm Saturn identified by TESS and confirmed withground-based observations from Minerva-Australis, NRES, and the Las CumbresObservatory Global Telescope. This planet has a radius of$1.04^{+0.06}_{-0.05}\,R_{Jup}$, a mass of $0.214^{+0.040}_{-0.038}\,M_{Jup}$,an orbital period of $9.5739^{+0.0002}_{-0.0001}$ days, and an extremely lowdensity ($\rho$=0.252$\pm$0.091 g cm$^{-3}$). TOI-1842b has among the bestknown combinations of large atmospheric scale height (893 km) and host-starbrightness ($J=8.747$ mag), making it an attractive target for atmosphericcharacterisation. As the host star is beginning to evolve off the mainsequence, TOI-1842b presents an excellent opportunity to test models of gasgiant re-inflation. The primary transit duration of only 4.3 hours also makesTOI-1842b an easily-schedulable target for further ground-based atmosphericcharacterisation.

TOI-1842b: A Transiting Warm Saturn Undergoing Re-Inflation around an Evolving Subgiant