Old Clee, Grimsby
 Holy Trinity and St. Mary the Virgin, (Old Clee). Submitted by Katarzyna |
Old Sleaford
- St Giles - Lost after 1300
Osgodby
 Methodist Chapel. Submitted by Katarzyna |
 Chapel of Our Lady and St Joseph. Submitted by Katarzyna |
Owersby (North)
 Former Weslyan Church. Submitted by Katarzyna |
 St Martin. Submitted by Katarzyna |
Owmby by Spital
 Primitive Methodist Church. Submitted by Katarzyna |
 St. Peter and St. Paul. Submitted by Katarzyna |
Owston (Ferry)
 St. Martin's. Submitted by Anne in Carlisle |
Oxcombe
 All Saints'. Submitted by Katarzyna |
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