The Šumera is a river in the Kėdainiai district municipality, Kaunas County, central Lithuania. It flows for and has a basin area of . The river flows into the Obelis (from the right side), a tributary of the Nevėžis, which is in turn a tributary of the Neman.
The Šumera starts nearby former Dargužiai village and flows mostly southwards through agriculture lands and the Lančiūnava-Šventybrastis Forest. It meets the Obelis in Pašumerys village.
The name Šumera (or Šiumera) is of obscure origin, maybe derived from Lithuanian Germanism šiumas ('foam, decoction').
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