Mary I (1516–1558) was Queen of England and Ireland 1553–1558.

Mary I may also refer to:

• Mary I, Countess of Menteith (13th century)
• Mary, Queen of Hungary (1371–1395)
• Mary, Duchess of Burgundy (1457–1482)
• Mary, Queen of Scots (1542–1587), Mary I of Scotland
• Maria I of Portugal (1734–1816)
• Mary Immaculate College or Mary I, a college in Limerick, Ireland

• Queen Mary (disambiguation)

This disambiguation page lists articles associated with the title Mary I.
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