Harbai, ( date of birth unknown; † 1330 ), was Negus Nagast ( Emperor ) of Ethiopia. According to some records, he was a member of the Zagwe Dynasty. He is regarded as the ancestor of the kings of the Ethiopian province of Lasta.

Little is known about his reign. EA Wallis Budge indicates a period of 20 years and writes that Mairari died around 1330.