Sundadanio echinus

{{Short description|Species of fish}}

{{speciesbox

| image =

| status = VU | status_system = IUCN3.1

| status_ref = {{cite iucn |author=Lumbantobing, D. |year=2019 |title=Sundadanio echinus |volume=2019 |page=e.T91075441A91075451 |doi=10.2305/IUCN.UK.2019-3.RLTS.T91075441A91075451.en |access-date=17 November 2022}}

| genus = Sundadanio

| species = echinus

| authority = Conway, Kottelat & H. H. Tan, 2011

}}

Sundadanio echinus is a species of freshwater ray-finned fish belonging to the family Sundadanionidae, the tiny danios.{{Cof genus|genus=Sundadanio|access-date=27 January 2025}} It is endemic to Borneo and found in West Kalimantan (Indonesia) and western Sarawak (Malaysia). It lives in peat swamps and blackwater streams.

Sundadanio echinus reaches a maximum size of {{convert|2.1|cm|abbr=on}} standard length.