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We report the discovery of a transiting exoplanet, KELT-11b, orbiting thebright ($V=8.0$) subgiant HD 93396. A global analysis of the system shows thatthe host star is an evolved subgiant star with $T_{\rm eff} = 5370\pm51$ K,$M_{*} = 1.438_{-0.052}^{+0.061} M_{\odot}$, $R_{*} = 2.72_{-0.17}^{+0.21}R_{\odot}$, log $g_*= 3.727_{-0.046}^{+0.040}$, and [Fe/H]$ = 0.180\pm0.075$.The planet is a low-mass gas giant in a $P = 4.736529\pm0.00006$ day orbit,with $M_{P} = 0.195\pm0.018 M_J$, $R_{P}= 1.37_{-0.12}^{+0.15} R_J$, $\rho_{P}= 0.093_{-0.024}^{+0.028}$ g cm$^{-3}$, surface gravity log ${g_{P}} =2.407_{-0.086}^{+0.080}$, and equilibrium temperature $T_{eq} =1712_{-46}^{+51}$ K. KELT-11 is the brightest known transiting exoplanet hostin the southern hemisphere by more than a magnitude, and is the 6th brightesttransit host to date. The planet is one of the most inflated planets known,with an exceptionally large atmospheric scale height (2763 km), and anassociated size of the expected atmospheric transmission signal of 5.6%. Theseattributes make the KELT-11 system a valuable target for follow-up andatmospheric characterization, and it promises to become one of the benchmarksystems for the study of inflated exoplanets.

KELT-11b: A Highly Inflated Sub-Saturn Exoplanet Transiting the V=8 Subgiant HD 93396