Eylo or Gilo (fl. c. 868) is the first attested count of Álava. He is known from the chronicle of Sampiro, written in the first third of the eleventh century, which presents him as a rebellious subject of the Kingdom of Asturias, strongly suggesting that he was not appointed count by the king but was instead the leader of a rebellion. After King Alfonso III marched an army into Álava, the people submitted and Eylo was taken into captivity and brought back to Alfonso's capital of Oviedo.