Eochaid I Buide (Scottish Gaelic: Eochaid Buide mac Áedo) was king of Dál Riada from 608 until 629. He was the younger son of King Áedán mac Gabráin and succeeded his father upon the death of his elder brothers. "Buide" refers to the colour yellow, as in the colour of his hair. He died in 629 and was succeeded by Connad.