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- Our Lady Mother of Mercy, Brothers of
- Our Lady of Charity, North American Union Sisters of
- Our Lady of Good Counsel
- Our Lady of Perpetual Help (Succour)
- Our Lady of the Garden, Sisters of
- Our Lady of the Missions, Sisters of
- Our Lady of the Sacred Heart, Daughters of
- Our Lady of the Snow
- Our Lady of the Way, Society of
- Our Lady of Victory Missionary Sisters
- Oury, Gerard
- Ouziel, ben-Zion Meir Ḥai
- Ovadia, Nissim J.
- Ovalle, Alfonso de
- Ovariotomy
- Ovchinski, Levi
- Oved, Margalit
- Overberg, Bernard
- Ovid in Christian Culture
