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We report the discovery of HAT-P-30b, a transiting exoplanet orbiting theV=10.419 dwarf star GSC 0208-00722. The planet has a periodP=2.810595+/-0.5 d, transit epoch Tc = 2455456.46561+/-0.00037 (BJD), andtransit duration 0.0887+/-0.0015 d. The host star has a mass of 1.24+/-0.04Msun, radius of 1.21+/-0.05 Rsun, effective temperature 6304+/-88 K, andmetallicity [Fe/H] = +0.13+/-0.08. The planetary companion has a mass of0.711+/-0.028 Mjup, and radius of 1.340+/-0.065 Rjup yielding a mean density of0.37+/-0.05 g cm^-3. We also present radial velocity measurements that wereobtained throughout a transit that exhibit the Rossiter-McLaughlin effect. Bymodeling this effect we measure an angle of \lambda = 73.5+/-9.0 deg betweenthe sky projections of the planet's orbit normal and the star's spin axis.HAT-P-30b represents another example of a close-in planet on a highly tiltedorbit, and conforms to the previously noted pattern that tilted orbits are morecommon around stars with Teff > 6250 K.

HAT-P-30b: A transiting hot Jupiter on a highly oblique orbit