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We report the discovery of WASP‐5b, a Jupiter‐mass planet orbiting a 12th‐mag G‐type star in the Southern hemisphere. The 1.6‐d orbital period places WASP‐5b in the class of very hot Jupiters and leads to a predicted equilibrium temperature of 1750 K. WASP‐5b is the densest of any known Jovian‐mass planet, being a factor of 7 denser than TrES‐4, which is subject to similar stellar insolation, and a factor of 3 denser than WASP‐4b, which has a similar orbital period. We present transit photometry and radial velocity measurements of WASP‐5 (= USNO‐B1 0487−0799749), from which we derive the mass, radius and density of the planet:   M  P = 1.58 +0.13  −0.08   M  J ,  R  P = 1.090 +0.094  −0.058   R  J   and  ρ P = 1.22 +0.19  −0.24  ρ J  . The orbital period is   P = 1.6284296 +0.48  −0.37   d and the mid‐transit epoch is   T  C  (HJD) = 245 4375.62466 +0.00026  −0.00025  .

WASP‐5b: a dense, very hot Jupiter transiting a 12th‐mag Southern‐hemisphere star