Sundadanio margarition

{{Short description|Species of fish}}

{{speciesbox

| image =

| status = NT | status_system = IUCN3.1

| status_ref = {{cite iucn |author=Lumbantobing, D. |year=2019 |title=Sundadanio margarition |volume=2019 |page=e.T91075715A91075732 |doi=10.2305/IUCN.UK.2019-2.RLTS.T91075715A91075732.en |access-date=18 November 2022}}

| taxon = Sundadanio margarition

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

}}

Sundadanio margarition 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 Sarawak, Malaysian Borneo, and known from the Rajang and Sarawak River drainages. It lives in coastal peat swamp forests.

Sundadanio margarition reaches a maximum size of {{convert|1.9|cm|abbr=on}} standard length.