Mary I may refer to:
- Mary I of England — Queen of England; daughter of Henry VIII (1516–1558)
- Mary I of Scotland — Queen of Scotland; famously known as Mary, Queen of Scots (1542–1587)
This disambiguation page, one that points to other pages that might otherwise have the same name, lists articles associated with the name Mary I. If an internal link led you here, you may wish to change the link to point directly to the intended article.