Ochsenheimeria vacculella, the cereal stem moth, is a moth of the family Ypsolophidae. It is found in most of Europe, except Ireland, Norway, Portugal, Italy and most of the Balkan Peninsula. The species was accidentally introduced into parts of the United States.
The wingspan is . Adults are on wing in July and August.
The larvae feed on plants including Agropyron cristatum, Elymus caninus, Elymus repens, Bromus erectus, Bromus inermis, Festuca pratensis, Lolium, Phleum pratense, Poa, Secale cereale and Triticum aestivum. They can be found from April to May.