Records starting with O
- Oak Street, Green Street Baptist: Manchester City Centre
- Oak Street- See Manchester, Cooper Street Calvinistic Methodist (above): Manchester City Centre
- Octagon Calvinistic Methodist: Chester
- Octagon Unitarian, Temple Court: Liverpool
- Ogden Baptist: Butterworth (Rochdale)
- Ogden Street Primitive Methodist- See Ardwick, Higher Ardwick Primitive Methodist (above): Ardwick
- Old Chapel Presbyterian: Dukinfield
- Old Glossop Wesleyan, Wesley Street: Glossop
- Old Market Street Wesleyan- See Blackley, Exchange Street Wesleyan (above): Blackley
- Old St George: Stalybridge
- Oldham Road Congregational: Manchester City Centre
- Oldham Road Primitive Methodist: Royton
- Oldham Road Wesleyan- See Manchester, Wesley, Livesey Street, Oldham Road (below): Manchester City Centre
- Oldham Street Methodist New Connexion: Manchester City Centre
- Oldham Street Wesleyan- See Manchester, Central Hall, Oldham Street (formerly Oldham Street Wesleyan) (above): Manchester City Centre
- Orchard Street Independent: Stockport
- Ordsall Park Wesleyan- See Salford, Dock Methodist Mission (above): Salford
- Our Lady and St John (Roman Catholic): Chorlton-on-Medlock
- Our Lady and St Nicholas- See Liverpool, St Nicholas (below): Liverpool
- Our Lady of Mercy and St Thomas of Canterbury: Gorton
- Oxford Hall Wesleyan (formerly Oxford Road Wesleyan): Chorlton-on-Medlock
- Oxford Road Primitive Methodist: Altrincham
- Oxford Road United Methodist Free Church: Chorlton-on-Medlock