Fortún Galíndez (floruit 924–972) was a powerful nobleman in the Kingdom of Navarre in the tenth century. He is the only recorded Navarrese of that time to bear the title dux (duke). He was entrusted by Sancho I with the newly conquered territory of the Rioja Alta around Nájera. In 924 he held the title senior in Naiera (lord in Nájera); from 942 he was praefectus in Naiera (prefect in Nájera); and from 950 he was titled dux. He appears to have governed the Rioja with quasi-regal authority, part of a Navarrese experiment in creating a new kingdom, which would be the Kingdom of Viguera.