'''Lauik Kaspia''' atau '''Danau Kaspia''' marupoan kumpulan aia nan paliang gadang lawehnyo nan talatak di ateh tanah daratan [[Bumi|bumi]], sainggo dapek digologan sabagai [[Danau|danau]] nan palaing gadang di dunia atau buliah pulo disabuik sabagai [[Lauik|lauik]].<ref name=web1>{{cite web|title=Caspian Sea - Background|url="[http://www.caspianenvironment.org/newsite/Caspian-Background.htm|publisher= Caspian Sea - Background]". Caspian Environment Programme|accessdate=. 2009. Diakses 11 September 2012|year=2009}}.</ref><ref>{{cite web | title"[http://www.esa.int/esaEO/SEM5GYTLWFE_index_0.html =ESA: Observing the Earth – Earth from Space: The southern Caspian Sea |publisher =]". ESA.int| url = http://www.esa.int/esaEO/SEM5GYTLWFE_index_0.html|accessdate=Diakses 2007-05-25}}.</ref> Danau iko mamiliaki pamukoan salaweh 371,000 km2 (143,200 kaki pasagi) (indak tamasuak [[Laguna|laguna]] [[Garabogazköl Aylagy|Garabogazköl Aylagy]] di [[Turkmenistan|Turkmenistan]]) jo volume aia 78.200 km3 (18.800 kubik mil).<ref name="LakeNet">[http://www.worldlakes.org/lakedetails.asp?lakeid=8762 Lake Profile: Caspian Sea]. ''LakeNet.''</ref> Danau iko tasumbek, indak ado saluaran aia kaluanyo (''endorheic basin''), sarato babateh ka barat lauik jo [[Rusia|Rusia]], ka barat jo [[Azerbaijan|Azerbaijan]], ka salatan jo [[Iran|Iran]], ka tenggara jo Turkmenistan, dan ka timur lauik jo [[Kazakhstan|Kazakhstan]].
Banso-banso kuno nan tingga dakek pasisianyo maanggap danau ko sabagai lauik, kamungkian karano raso aianyo nan taraso asin atau karano lawehnyo. Kadar garam danau ko kiro-kiro 1.2%, yaitu sapetigo kadar garam lauik pado umumnyo.
