Lycodon effraenis

{{Short description|Species of snake}}

{{speciesbox

| image = Lycodon effraenis 61267383 (cropped).jpg

| image_caption =

| status = LC

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=Grismer, L. |author2=Chan-Ard, T. |author3=Inger, R.F. |author4=Auliya, M. |author5=Dehling, M. |year=2013 |title=Lycodon effraenis |volume=2013 |page=e.T176842A44272505 |doi=10.2305/IUCN.UK.2013-1.RLTS.T176842A44272505.en |access-date=27 May 2023}}

| genus = Lycodon

| species = effraenis

| authority = Cantor, 1847

| synonyms =

}}

The brown wolf snake (Lycodon effraenis) is a species of snake in the family colubridae. It is found in Malaysia, Brunei, Indonesia, and Thailand.