Erna may refer to:
People Erna (given name), a list of people with the name Jeff Erna, American drummer Sully Erna (born 1968), American musician and member of Godsmack pen name of Anna van Gogh-Kaulbach (1869-1960), Dutch writer Érna, or Iverni, a people of medieval Ireland
Other uses Erna (mythology), a figure in Norse mythology Erna (moth), genus of moths in the family Erebidae Little Erna, the butt of Little Erna jokes popular in Hamburg Erna (planet), a fictional world in C. S. Friedman's Coldfire Trilogy Erna long-range reconnaissance group, a Finnish Army unit of Estonian volunteers which operated behind Red Army lines in World War II Erna Raid, a former military exercise held annually in Estonia Erna, Texas, United States, an unincorporated community 406 Erna, a main belt asteroid Enhancer RNAs Environmental RNA , a German coaster in service 1922-46
See also Urna (disambiguation)