| # | Tower | No | Year | Materials | Maker | Trusses | Layout |
|---|
| 6651 | Ossington, Nottinghamshire, Holy Rood | 2 | 1979 | Steel | Local labour/guild/assn | | |
| 6652 | Ossington, Nottinghamshire, Holy Rood | 1 | 1979 | Steel | Local labour/guild/assn | | |
| 6653 | Osterley, Greater London, S Mary, Osterley Road | 1 | | Timber | | | |
| 6654 | Oswaldkirk, North Yorkshire, S Oswald | 1 | c1886 | Oak | | 6.A | 2.X1 |
| 6655 | Oswaldtwistle, Lancashire, Immanuel | 1 | 1913 | Cast iron | John Taylor & Co | | |
| 6656 | Oswestry, Shropshire, S Oswald K&M | 1 | | Timber | | | 8.3 |
| 6657 | Otford, Kent, S Bartholomew | 1 | 2000 | Cast iron | Whitechapel Bell Foundry | 8.3.A.h | 6.1 |
| 6658 | Otham, Kent, S Nicholas | 1 | 1906 | Oak | Mears & Stainbank | 6.A | 3.1 ➔ 6.1 |
| 6659 | Otham, Kent, S Nicholas | 1.1 | 2012 | Steel | John Taylor & Co | 8.1.B.a | 2.X2 |
| 6660 | Otham, Kent, S Nicholas | 1.2 | 2012 | Steel | John Taylor & Co | | 1 |
| 6661 | Othery, Somerset, S Michael | 1 | 1860 | Oak | Henry Boswell | | |
| 6662 | Otley, Suffolk, S Mary | 1 | 1933 | Timber | Local firm | 6.A | 6.5 R |
| 6663 | Otley, West Yorkshire, All Saints | 1 | 1922 | Cast iron | Gillett & Johnston | 8.3.C.e | 8.3 |
| 6664 | Otterford, Somerset, S Leonard | 1 | 1904 | Cast iron & timber | Thomas Doble | 7.A.a | 6.X |
| 6665 | Otterham, Cornwall, S Denis | 1 | 1953 | Cast iron | John Taylor & Co | 8.3.A.h | 6.X |
| 6666 | Otterhampton, Somerset, All Saints | 1 | † | Oak | | | |
| 6667 | Ottershaw, Surrey, Christ Church | 2 | 1885 | Cast iron | John Taylor & Co | 8.3.C.b | 2.X1 |
| 6668 | Ottershaw, Surrey, Christ Church | 1 | 1885 | Cast iron | John Taylor & Co | 8.3.C.b | 4.2 |
| 6669 | Otterton, Devon, S Michael | 2 | 1890 | Oak | Harry Stokes | 6.A | |
| 6670 | Otterton, Devon, S Michael | 1 | 1865 | Oak | Thomas I Hooper | 6.D | 5.12 |
| 6671 | Ottery St Mary, Devon, S Mary V | 1 | 1949 | Cast iron | John Taylor & Co | 8.3.A.h | 8.3 |
| 6672 | Ottringham, East Riding of Yorkshire, S Wilfrid | 1 | | Timber | | | |
| 6673 | Oulton, Suffolk, S Michael | 1 | 1980 | Cast iron | John Taylor & Co | 8.3.A.h | 6.1 |
| 6674 | Oundle, Northamptonshire, S Peter | 1 | 1869 | Timber | | | |
| 6675 | Ousden, Suffolk, S Peter | 1 | 1758 | Oak | E Willis | 5.H | 5.12 R |
| 6676 | Outwell, Norfolk, S Clement | 1 | | Oak | | 6.L | 6.4 |
| 6677 | Outwood, Surrey, S John Bapt | 1 | 1875 | Pine | John Warner & Sons | 6.A | 4.3 |
| 6678 | Over, Cambridgeshire, S Mary | 9 | | Stone | | ~ 9.A | 1 |
| 6679 | Over, Cambridgeshire, S Mary | 1 | 1931 | Cast iron | Mears & Stainbank | 8.3.A.h | 8.3 |
| 6680 | Over, Cheshire, S Chad | 1 | 1938 | Teak | John Taylor & Co | 6.A | 8.3 |
| 6681 | Over Compton, Dorset, S Michael | 1 | c1821 | Timber | (unidentified) | | |
| 6682 | Over Kellet, Lancashire, S Cuthbert | 2 | 2023 | Cast iron & steel | John Taylor & Co | 8.1.B.a & 8.3.A.h | 5.12 R |
| 6683 | Over Kellet, Lancashire, S Cuthbert | 1 | 2023 | Cast iron | John Taylor & Co | 8.3.A.h | 3.X |
| 6684 | Over Kellet, Lancashire, S Cuthbert | 1A | 2023 | Steel | John Taylor & Co | 8.1.E | 1 |
| 6685 | Over Stowey, Somerset, S Peter & S Paul | 1 | 1939 | Teak | John Taylor & Co | 6.A | 6.1 |
| 6686 | Over Whitacre, Warwickshire, S Leonard | 1 | 1933 | Cast iron | John Taylor & Co | 8.3.A.h | 2.X1 |
| 6687 | Over Winchendon, Buckinghamshire, S Mary Magd | 9 | | Timber | | 1.A & 1.D | |
| 6688 | Over Winchendon, Buckinghamshire, S Mary Magd | 1 | 1675 | Timber | | 6.A | 3.1 |
| 6689 | Overbury, Worcestershire, S Faith | 1 | 1880 | Timber | Frederick White | 6.A | 5.1 ➔ 6.X |
| 6690 | Overbury, Worcestershire, S Faith | 1.1 | 1903 | Oak | John Taylor & Co | 6.A | 1 |
| 6691 | Overseal, Derbyshire, S Matthew | 2 | 1919 | Cast iron | John Taylor & Co | | |
| 6692 | Overseal, Derbyshire, S Matthew | 1 | 1919 | Cast iron | John Taylor & Co | | |
| 6693 | Overstone, Northamptonshire, S Nicholas | 1 | 1903 | Timber | John Taylor & Co | 6.A | 3.1 |
| 6694 | Overton, Hampshire, S Mary | 1 | 1908 | Steel | Mears & Stainbank | 8.1.B.a | 6.1 ➔ 8.3 |
| 6695 | Overton, Hampshire, S Mary | 1.1 | 1945 | Steel | Mears & Stainbank | 8.1.B.a | 2.X2 |
| 6696 | Overton on Dee, Wrexham, Wales, S Mary V | 1 | 1826 | Oak | James Jacques | 6.A, 6.D & 6.J | 6.X |
| 6697 | Oving, Buckinghamshire, All Saints | 1 | 1887 | Oak | John Warner & Sons | | 3.1 |
| 6698 | Ovingham, Northumberland, S Mary V | 1 | 2011 | Steel | Local labour/guild/assn | | 8.3 |
| 6699 | Owlsmoor, Berkshire, S George | 2 | | Steel | | 8.1.A | |
| 6700 | Owlsmoor, Berkshire, S George | 1 | | Steel | | 8.1.A | |