Trimerodytes annularis

{{Short description|Species of snake}}

{{speciesbox

| image =

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| status = LC

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=Zhou, Z. & Lau, M. |date=2021 |title=Trimerodytes annularis |volume=2021 |page=e.T192052A2033475 |url=https://www.iucnredlist.org/species/192052/2033475 |access-date=19 November 2021}}

| genus = Trimerodytes

| species = annularis

| authority = (Hallowell, 1856)

| synonyms = * Tropidonotus annularis Hallowell, 1856

• Tropidonotus chinensis Jan, 1859
• Tropidonotus semifasciatus Berthold, 1859
• Tropidonotus habereri Werner, 1903
• Sinonatrix annularis

}}

The red-bellied annulate keelback or ringed water snake (Trimerodytes annularis) is a species of snake in the family Colubridae. It is found in Taiwan and eastern China.{{NRDB species|genus=Trimerodytes|species=annularis|accessdate=2 March 2016}}