- Norvald Flaaten
- Okill Stuart (Primary Source)
- Olive Henderson (Primary Source)
- Olive Irene Moran Attridge
- Olive May Peat (née Matthews) (Primary Source)
- Oliver James Cole
- Oliver Thomas Jonesy Jones
- Omer Lévesque
- Omer Pinault
- Oren Foster
- Orest Cochkanoff
- Origène Poulin (Primary Source)
- Orille Hogue
- Orison Corcoran
- Orme Payne
