Dipsas neuwiedi, also known commonly as Neuwied's tree snake and dormideira-cinzenta (gray sleepyhead) in Brazilian Portuguese, is a species of snake in the subfamily Dipsadinae of the family Colubridae. The species is endemic to Brazil.
The specific name, neuwiedi, is in honor of German naturalist Prince Maximilian of Wied-Neuwied.
A medium-sized species of snake, Dipsas neuwiedi may attain a snout-to-vent length (SVL) of .
Dipsas neuwiedi is found in southeastern Brazil.
The preferred natural habitats of Dipsas neuwiedi are forest and savanna, at elevations from sea level to .
Dipsas neuwiedi is arboreal and nocturnal.
Dipsas neuwiedi preys upon snails and slugs.
Dipsas neuwiedi is oviparous. Clutch size is about eight eggs.