Santa Elena Poco Uinic
{{Infobox ancient site
| name = Santa Elena Poco Uinic
| alternate_name = Poco Uinic
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| map_type = Mesoamerica
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| map_caption = Location within Mesoamerica
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| coordinates = {{coord|16|35|14.9172|N|91|44|20.4756|W|display=inline}}
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| region = Chiapas
| built =
| abandoned =
| epochs = Late Classic
| cultures = Maya civilization
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Santa Elena Poco Uinic (also known as just Poco Uinic) is a Classic Maya site in Chiapas, Mexico.{{Cite book |last=Iwaniszewski |first=Stanislaw |url=https://ui.adsabs.harvard.edu/abs/2021acas.book..237I |title=Remarks on the Lunar Series and Eclipse Cycles in Late Classic Maya Records |date=2021-01-01|bibcode=2021acas.book..237I }} It contains Stela 3, that has the date 9.17.19.13.16 5 K'ib' 14 Ch'en and a glyph that indicates an eclipse. An eclipse was recorded as occurring on July 16, 790 CE O.S., so this find has frequently been proposed as a way to establish a correlation between the Maya Calendar and the Julian Calendar.