We report the discovery of WASP-10b , a new transiting extrasolar planet ( ESP ) discovered by the WASP Consortium and confirmed using NOT FIES and SOPHIE radial velocity data . A 3.09 day period , 29 mmag transit depth , and 2.36 hour duration are derived for WASP-10b using WASP and high precision photometric observations . Simultaneous fitting to the photometric and radial velocity data using a Markov-chain Monte Carlo procedure leads to a planet radius of 1.28R _ { J } , a mass of 2.96M _ { J } and eccentricity of \approx 0.06 . WASP-10b is one of the more massive transiting ESPs , and we compare its characteristics to the current sample of transiting ESP , where there is currently little information for masses greater than \approx 2M _ { J } and non-zero eccentricities . WASP-10 ’ s host star , GSC 2752-00114 ( USNO-B1.0 1214-0586164 ) is among the fainter stars in the WASP sample , with V=12.7 and a spectral type of K5 . This result shows promise for future late-type dwarf star surveys .