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We report the discovery of KELT-10b, the first transiting exoplanetdiscovered using the KELT-South telescope. KELT-10b is a highly inflatedsub-Jupiter mass planet transiting a relatively bright $V = 10.7$ star (TYC8378-64-1), with T$_{eff}$ = $5948\pm74$ K, $\log{g}$ =$4.319_{-0.030}^{+0.020}$ and [Fe/H] = $0.09_{-0.10}^{+0.11}$, an inferred massM$_{*}$ = $1.112_{-0.061}^{+0.055}$ M$_{\odot}$ and radius R$_{*}$ =$1.209_{-0.035}^{+0.047}$ R$_{\odot}$. The planet has a radius R$_{P}$ =$1.399_{-0.049}^{+0.069}$ R$_{J}$ and mass M$_{P}$ = $0.679_{-0.038}^{+0.039}$M$_{J}$. The planet has an eccentricity consistent with zero and a semi-majoraxis $a$ = $0.05250_{-0.00097}^{+0.00086}$ AU. The best fitting linearephemeris is $T_{0}$ = 2457066.72045$\pm$0.00027 BJD$_{TDB}$ and P =4.1662739$\pm$0.63 days. This planet joins a group of highly inflatedtransiting exoplanets with a radius much larger and a mass much less than thoseof Jupiter. The planet, which boasts deep transits of 1.4%, has a relativelyhigh equilibrium temperature of T$_{eq}$ = $1377_{-23}^{+28}$ K, assuming zeroalbedo and perfect heat redistribution. KELT-10b receives an estimatedinsolation of $0.817_{-0.054}^{+0.068}$ $\times$ 10$^9$ erg s$^{-1}$ cm$^{-2}$,which places it far above the insolation threshold above which hot Jupitersexhibit increasing amounts of radius inflation. Evolutionary analysis of thehost star suggests that KELT-10b is unlikely to survive beyond the currentsubgiant phase, due to a concomitant in-spiral of the planet over the next$\sim$1 Gyr. The planet transits a relatively bright star and exhibits thethird largest transit depth of all transiting exoplanets with V $<$ 11 in thesouthern hemisphere, making it a promising candidate for future atmosphericcharacterization studies.

KELT-10b: The First Transiting Exoplanet from the KELT-South Survey -- A Hot Sub-Jupiter Transiting a V = 10.7 Early G-Star