Gasosaurus (/ɡˈæsəˈsɔːrəs/) is a genus of tetanuran theropod that lived approximately 171.6 to 161.2 million years ago during the middle of the Jurassic Period.

The first and to date only fossils, albeit postcranial (missing the skull), were recovered in 1985 during the construction of a gas facility, which explains the dinosaur's unusual name.

Many potentially informative features of the holotype skeleton (IVPP V7264) are difficult to assess based on published descriptions and images.

[6] It may in fact be the most basal coelurosaurian yet known, or may even be close to the common ancestor of the two groups; in any case, it represents one of the oldest definitive tetanuran theropods.

[8] These similar dinosaurs show an intriguing combination of derived tetanuran synapomorphies and primitive features shared with non-tetanurans, which suggest they occupy a basal position within Tetanurae.