Mecyna flavalis is a species of moth in the family Crambidae. It is known from most of Europe (except Ireland, Norway, Portugal, Slovenia and Ukraine)"Mecyna flavalis (Denis & Schiffermüller, 1775)" Fauna Europaea. Retrieved May 29, 2018. to Japan. The species was first described by Michael Denis and Ignaz Schiffermüller in 1775.
The wingspan is 25–29 mm. Adults are on wing from July to August."63.039 BF1396 Mecyna flavalis ([Denis & Schiffermüller], 1775)". UKMoths. Retrieved May 29, 2018.
The larvae feed on Galium mollugo, Artemisia campestris, Ballota, Reseda and Urtica urens.
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