38.74 Official language(s) Amharic Recognised regional languages Other languages official amongst the different ethnicities and their respective regions . Ethnic groups   Oromo 34.49%, Amhara 26.89%, Somali 6.20%, Tigray 6.07%; Sidama 4.01%, Gurage 2.53%, Welayta 2.31% and around eighty other small ethnic groups. Demonym Ethiopian Government Federal parliamentary republic Establishment  -  Traditional