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We report the discovery of KELT-20b, a hot Jupiter transiting a V~7.6 early Astar with an orbital period of P~3.47 days. We identified the initial transitsignal in KELT-North survey data. Archival and follow-up photometry, the Gaiaparallax, radial velocities, Doppler tomography, and adaptive optics imagingwere used to confirm the planetary nature of the companion and characterize thesystem. From global modeling we infer that the host star HD 185603 is arapidly-rotating (VsinI~120 km/s) A2V star with an effective temperature of$T_{eff}$=8730K, mass of $M_{star}=1.76M_{sun}$, radius of$R_{star}=1.561R_{sun}$, surface gravity of logg=4.292, and age of <600 Myr.The planetary companion has a radius of $1.735^{+0.070}_{-0.075}~R_{J}$, asemimajor axis of $a=0.0542^{+0.0014}_{-0.0021}$AU, and a linear ephemeris of$BJD_{TDB}=2457503.120049 \pm 0.000190 + E(3.4741070\pm0.19)$. We place a$3\sigma$ upper limit of ~3.5 $M_{J}$ on the mass of the planet. The Dopplertomographic measurement indicates that the planetary orbit is well aligned withthe projected spin-axis of the star ($\lambda= 3.4\pm {2.1}$ degrees). Theinclination of the star is constrained to be $24.4<I_*<155.6$ degrees, implyinga true (three-dimensional) spin-orbit alignment of $1.3<\psi<69.8$ degrees. Theplanet receives an insolation flux of $\sim 8\times 10^9~{\rmerg~s^{-1}~cm^{-2}}$, implying an equilibrium temperature of of ~ 2250 K,assuming zero albedo and complete heat redistribution. Due to the high stellar$T_{eff}$, the planet also receives an ultraviolet (wavelengths $d\le 91.2$~nm)insolation flux of $\sim 9.1\times 10^4~{\rm erg~s^{-1}~cm^{-2}}$, which maylead to significant ablation of the planetary atmosphere. Together withWASP-33, Kepler-13 A, HAT-P-57, KELT-17, and KELT-9, KELT-20 is the sixth Astar host of a transiting giant planet, and the third-brightest host (in V) ofa transiting planet.

KELT-20b: A giant planet with a period of P~ 3.5 days transiting the V~ 7.6 early A star HD 185603