Two goals in the third quarter proved decisive as Mayo captured their 42nd Connacht minor football title in a good final at Tuam Stadium.
Galway, who went on to win the All-Ireland last year after losing the Connacht title to Mayo, led by 0-8 to 0-7 at the break after an opening half where both teams were on top for periods in the perfect conditions at Tuam Stadium.
Galway scored opening three points, with captain Shay McGlinchey getting two excellent efforts from distance off either foot, before Mayo responded and kicked five points without reply.
Galway got on top again and landed the next four scores to lead by 0-7 to 0-5 approaching half-time.
Mayo sub Thomas Tuffy slotted home a fine goal into the bottom left corner to give his team a 2-10 to 0-10 lead going into the final quarter.
Fionán Ó Conghaile fired home a goal 12 minutes from time after collecting a pass from another sub Stephen O’Grady to cut the gap to 2-10 to 1-10 but two more points from Lydon and one from man-of-the-match Darragh Beirne wrapped up a deserved win for Mayo.