Dipsas williamsi

{{Short description|Species of snake}}

{{Speciesbox

| image =

| status = VU

| status_system=IUCN3.1

| status_ref=Lehr E, Perez J (2019). [https://www.iucnredlist.org/species/48617731/48617742 Dipsas williamsi]. In: IUCN 2020. IUCN Red List of Threatened Species. Version 2022.2.

| genus = Dipsas

| species = williamsi

| authority = (Carrillo de Espinoza, 1974)

| synonyms =

}}

Dipsas williamsi, also known commonly as Williams's tree snake, is a species of nonvenomous snake in the subfamily Dipsadinae of the family Colubridae. The species is endemic to Peru.{{NRDB species|genus=Dipsas|species=williamsi|access-date=13 November 2014}} It was named in honor of Ernest Edward Williams by Nelly Carrillo Espinoza (1974).