Nebulasaurus is an extinct genus of basal eusauropod dinosaur known from the early Middle Jurassic (Aalenian or Bajocian stage) of Yunnan Province, China. It is known only from the holotype braincase -v.d.1. A phylogenetic analysis found Nebulasaurus to be a sister taxon to Spinophorosaurus from the Middle Jurassic of Africa. This discovery is significant paleontologically because it represents a clade of basal eusauropods previously unknown from Asia.