Tropidonophis spilogaster

{{Short description|Species of snake}}

{{Speciesbox

| image = Rhabdophis_spilogaster_(KU_327287)_from_Barangay_Dibuluan,_San_Mariano_-_ZooKeys-266-001-g093.jpg

| status = LC

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=Brown, R. |author2=Rico, E. |author3=Afuang, L. |date=2009 |title=Rhabdophis spilogaster |volume=2009 |page=e.T169802A6675725 |doi=10.2305/IUCN.UK.2009-2.RLTS.T169802A6675725.en |access-date=18 November 2021}}

| genus = Tropidonophis

| species = spilogaster

| authority = (Boie, 1827)

| synonyms = Tropidonotus spilogaster Boie, 1827

Tropidonotus crebripunctatus Wiegmann, 1835

}}

Tropidonophis spilogaster, commonly known as the northern water snake or Boie's keelback, is a keelback snake in the family Colubridae found in the Philippines on the islands of Catanduanes, Polillo, Calayan and in the province of Bataan on the island of Luzon. The snake’s venom toxicity is unknown due to lack of study.