The Baltupis is a river of Kėdainiai district municipality, Kaunas County, central Lithuania. It flows for 4.8 kilometres and has a basin area of 2.7 km². It is a tributary of the Nevėžis River. The Baltupis goes on the edge between Sirutiškis village and the northern limit of Kėdainiai (Babėnai).
The name Baltupis means 'white river' in Lithuainian.
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References LIETUVOS RESPUBLIKOS UPIŲ IR TVENKINIŲ KLASIFIKATORIUS (Republic of Lithuania- River and Pond Classifications) . Ministry of Environment (Lithuania). Accessed 2011-11-17.