Posted in Government & Military, Schools & Education YIO stands for Yellow Iron Oxide YIO stands for Youth Involvement Ontario (Canada) YIO stands for Youth Intervention Officer (UK) YIO stands for Yamashina Institute for Ornithology (Japan) YIO Share Pinterest Tweet Whatsapp Post navigation YIOCYINQE Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment.