- O Antiphons
- O, My Jesus Prayer in Rosary
- Oceania Prayer
- October, Month of the Rosary
- Old Testament Marian Themes
- Old Testament Types of Mary
- Opera: Marian Presence
- Orthodox Tradition and Mary
- Our Lady of Africa Shrine
- Our Lady of America
- Our Lady of Atocha
- Our Lady of Auvergne
- Our Lady of Chaminade
- Our Lady of China
- Our Lady of Confidence
- Our Lady of Consolation
- Our Lady of Consolation Basilica
- Our Lady of Csiksomlyo
- Our Lady of Fatima
- Our Lady of Fatima Digital Collection
- Our Lady of Fatima in Historical Context
- Our Lady of Gentle Love
- Our Lady of Good Counsel
- Our Lady of Good Success
- Our Lady of Grace
- Our Lady of Grace, Title Origins
- Our Lady of Guadalupe, Coronation of
- Our Lady of Guadalupe: Icon of the Church in the Americas
- Our Lady of Guadalupe: Mexican National Symbol
- Our Lady of Hope
- Our Lady of Huronia Shrine
- Our Lady of Kodiak
- Our Lady of Lichen
- Our Lady of Light
- Our Lady of Loreto and Aviation
- Our Lady of Lourdes
- Our Lady of Madhu
- Our Lady of Mariapócs
- Our Lady of Mercy Symbols
- Our Lady of Mercy, Devotion to
- Our Lady of Mount Carmel Brown Scapular
- Our Lady of Olives
- Our Lady of Peace Basilica
- Our Lady of Penrhys Shrine
- Our Lady of Perpetual Help
- Our Lady of Perpetual Help, Devotion to
- Our Lady of Pilar
- Our Lady of Pochaev
- Our Lady of Pompeii
- Our Lady of Pompeii, Image of
- Our Lady of Prosperity
- Our Lady of Providence
- Our Lady of Ransom
- Our Lady of Šiluva
- Our Lady of Sorrows
- Our Lady of Sorrows, Title Origins
- Our Lady of Tears
- Our Lady of the Book
- Our Lady of the Cape
- Our Lady of the Chain, Origins
- Our Lady of the Chair
- Our Lady of the Clouds
- Our Lady of the Fire
- Our Lady of the Forest Shrine
- Our Lady of the Grasshopper
- Our Lady of the Iceberg
- Our Lady of the Miracle
- Our Lady of the Pillar
- Our Lady of the Rock
- Our Lady of the Rosary, Origins
- Our Lady of the Sacred Heart, Origins
- Our Lady of the Sea
- Our Lady of the Smile
- Our Lady of the Snows
- Our Lady of the Thumb
- Our Lady of Torreciudad, Image of
- Our Lady of Trakai
- Our Lady of Victory
- Our Lady of Vladimir
- Our Lady of York
- Our Lady's Dowry, England as