We report the discovery by the ground-based HATNet survey of the transiting exoplanet HAT-P-68b, which has a mass of 0.724 ± 0.043 M_Jupiter , and radius of 1.072 ± 0.012 R_Jupiter. The planet is in a circular P = 2.2984 day orbit around a moderately bright V = 13.937 ± 0.030 magnitude K dwarf star of mass 0.673 M_Sun , and radius 0.6726 ± 0.0069 R_Sun . The planetary nature of this system is confirmed through follow-up transit photometry obtained with the FLWO 1.2 m telescope, high-precision RVs measured using Keck-I/HIRES, FLWO 1.5 m/TRES, and OHP 1.9 m/Sophie, and high-spatial-resolution speckle imaging from WIYN 3.5 m/DSSI. HAT-P-68 is at an ecliptic latitude of +3degrees and outside the field of view of both the NASA TESS primary mission and the K2 mission. The large transit depth of 0.036 mag (r-band) makes HAT-P-68b a promising target for atmospheric characterization via transmission spectroscopy
