Rhacheosaurus is an extinct genus of marine crocodyliform belonging to the family Metriorhynchidae.

The genus was established by Christian Erich Hermann von Meyer in 1831 for skeletal remains from the Tithonian (Late Jurassic) of Germany.

[3] Several species of metriorhynchids are known from the Mörnsheim Formation (Solnhofen limestone, early Tithonian) of Bavaria, Germany: Rhacheosaurus gracilis, Dakosaurus maximus, Geosaurus giganteus and Cricosaurus suevicus.

The top predators of this Formation appear to be D. maximus and G. giganteus, which were large, short-snouted species with serrated teeth.

The long-snouted C. suevicus and R. gracilis would have fed mostly on fish, although the more lightly built Rhacheosaurus may have specialised towards feeding on small prey.