Ambassador Redwan Hussien has been appointed as ambassador extraordinary and plenipotentiary of Ethiopia to Eritrea.
Prior to his current appointment, he was ambassador of Ethiopia to Ireland.
Ethiopia and Eritrea have formally restored relations this month, ending 20 years of enmity.
Leaders of the two countries have agreed to reopen embassies, develop ports, and restart commercial airline flights.
Eritrea reopened its embassy in Addis Ababa last Monday.