 | | | | Av Time | | | Place | Races | 1st | 2nd | 3rd | Trophies | |
|---|
 Norton C | 19.5 | | | 3 | 3 | 1 | 0 | 1 | | |
| 1973 | | 19:50:40 | | Williams A & Norton C | Royal Engineers | 3 | | | | 1 | | |
| 1975 | | 18:46:12 | | Mawer A E & Norton C | Royal Engineers | 4 | | | | | | |
| 1976 | | 19:50:20 | | Mitchell G & Norton C | Royal Engineers | 1 | | 1 | | | Services | |
| Norton G | 33.0 | | | 10 | 1 | 0 | 0 | 0 | | |
| 1959 | | 32:58:43 | | Thorpe A & Norton G | UK Comcan Signal Regt | 10 | | | | | | |
| Nott Tim | 35.5 | | | 113 | 1 | 0 | 0 | 0 | | |
| 2015 | | 35:28:03 | | Nott Tim & Murray Kevin | Army Canoe Union | 113 | | | | | | |
| Noxon C F | 23.7 | | | 46 | 2 | 0 | 0 | 0 | | |
| 1978 | | 22:40:48 | | Jeacock S W & Noxon C F | Aylesbury | 27 | | | | | | |
| 1984 | | 24:39:40 | | Noxon C F & Turnham T | Aylesbury | 64 | | | | | | |
| Noyes H | 57.8 | | | 11 | 1 | 0 | 0 | 0 | | |
| 1956 | | 57:50:00 | | Noyes H & Maslen R | Wilts Gazette | 11 | | | | | | |
| Noyons Andrew | 27.0 | | | 96 | 1 | 0 | 0 | 0 | | |
| 2009 | | 26:58:06 | | Bray Julian & Noyons Andrew | Richmond | 96 | | | | | | |
| Nugent M | 38.7 | | | 33 | 2 | 0 | 0 | 0 | | |
| 1962 | | 34:54:45 | | Nugent M & Winter B | St Marys College | 25 | | | | | | |
| 1963 | | 42:27:06 | | Price M & Nugent M | St Marys College | 41 | | | | | | |
| Nutland Adrian | 25.7 | | | 84 | 1 | 0 | 0 | 0 | | |
| 2010 | | 25:43:10 | | Bell Stuart & Nutland Adrian | Devizes | 84 | | | | | | |
| Nutt K | 25.8 | | | 77 | 1 | 0 | 0 | 0 | | |
| 1992 | C2 | 25:45:15 | | Holloway P & Nutt K | Eyot Boat Club | 77 | | | | | | |
| Nuttall J W | 46.2 | | | 22 | 5 | 0 | 0 | 0 | | |
| 1957 | | 63:30:15 | | Nuttall J W & Payne F | RAF Melksham | 21 | | | | | | |
| 1958 | | 58:46:00 | | Nuttall J W & Smart J | Melksham Rover Scouts | 12 | | | | | | |
| 1959 | | 39:40:10 | | Nuttall J W & Perryman B | RAF Melksham | 18 | | | | | | |
| 1963 | | 34:36:56 | | Nuttall J W & Ritchie W | RAF Melksham | 29 | | | | | | |
| 1964 | | 34:17:30 | | Nuttall J W & Peacock D | RAF Melksham | 29 | | | | | | |
| Nutter Andy | 24.7 | | | 51 | 1 | 0 | 0 | 0 | | |
| 2016 | | 24:41:06 | | Wride Chris & Nutter Andy | Tower Hamlets | 51 | | | | | | |
| Nye Graham | 32.0 | | | 93 | 1 | 0 | 0 | 0 | | |
| 2016 | | 32:02:59 | | Dawson Matthew & Nye Graham | Batchworth Sea Scouts | 93 | | | | | | |
| Nye James | 24.3 | | | 63 | 1 | 0 | 0 | 0 | | |
| 2009 | | 24:17:24 | | Tyers Ian & Nye James | DEVON AND CORNWALL | 63 | | | | | | |
| Nye Marcus | 25.6 | | | 80 | 1 | 0 | 0 | 0 | | |
| 2015 | | 25:36:57 | | Daysh Tyler & Nye Marcus | Acu - Royal Engineers | 80 | | | | | | |
| O' Crualaoich Niall | 23.5 | | | 30 | 1 | 0 | 0 | 0 | | |
| 2011 | | 23:30:36 | | Mcintyre Sean & O' Crualaoich Niall | Phoenix | 30 | | | | | European | |
| O' Mahony Tony (Teddington) | 22.0 | | | 31 | 1 | 0 | 0 | 0 | | |
| 2022 | | 22:00:29 | | Walsh Tomas & O' Mahony Tony | International | 31 | | | | | | |
| O'Brian Brendan | 19.9 | | | 14 | 1 | 0 | 0 | 0 | | |
| 2010 | | 19:52:01 | | Hendron Henry & O'Brian Brendan | Richmond | 14 | | | | | | |
| O'Brien B | 21.7 | | | 29 | 1 | 0 | 0 | 0 | | |
| 1984 | | 21:44:52 | | Cutiock D & O'Brien B | Richmond | 29 | | | | | | |
| O'Brien Dom | 20.3 | | | 21 | 2 | 0 | 0 | 0 | | |
| 1993 | | 21:22:25 | | Cooke Ciaran & O'Brien Dom | Independent | 38 | | | | | | |
| 2009 | | 19:15:16 | | Cooke Ciaran & O'Brien Dom | Phoenix | 4 | | | | | European,Lee | |
| O'brien Simon | 28.9 | | | 101 | 1 | 0 | 0 | 0 | | |
| 2015 | FB | 28:56:58 | | Greensmith Ben & O'brien Simon | Independent | 101 | | | | | Tyne | |
| O'Byme Sheila | 21.8 | | | 6 | 1 | 0 | 0 | 0 | | |
| 1983 | | 21:47:57 | | Garrett Mary & O'Byme Sheila | Richmond & Argonauts - Cork | 6 | | | | | Ladies | |
| O'Byrne Sheila | 20.8 | | | 13 | 1 | 0 | 0 | 0 | | |
| 1984 | | 20:46:05 | | Garrett Mary & O'Byrne Sheila | Richmond & Argonauts - Cork | 13 | | | | | Ladies | |
| O'Callaghan Kevin | 22.8 | | | 22 | 1 | 0 | 0 | 0 | | |
| 2012 | | 22:45:47 | | O'Callaghan Kevin & Young Shane | Independent | 22 | | | | | | |
| O'Cearbhaill Derek | 26.6 | | | 25 | 1 | 0 | 0 | 0 | | |
| 2003 | C2 | 26:33:45 | | O'Cearbhaill Derek & Knight David | Dingle | 25 | | | | | | |
| O'Connell Andrew | 24.0 | | | 12 | 1 | 0 | 0 | 0 | | |
| 2003 | | 23:57:59 | | O'Connell Andrew & Tyrrell Paul | Malahide Sea Scouts | 12 | | | | | Scouts | |
| O'connell Elly | 23.6 | | | 42 | 1 | 0 | 0 | 0 | | |
| 2019 | | 23:37:57 | | O'connell Elly & Channon Peter | Richmond | 42 | | | | | | |
| O'Connor E C | 49.1 | | | 60 | 1 | 0 | 0 | 0 | | |
| 1967 | | 49:08:00 | | Hopkins T C & O'Connor E C | Tweeddale Boys club | 60 | | | | | | |
| O'Connor W H | 25.7 | | | 24 | 1 | 0 | 0 | 0 | | |
| 1967 | | 25:44:00 | | Jones K E & O'Connor W H | Borough Road College | 24 | | | | | | |
| O'Donovan D | 18.5 | | | 3 | 3 | 1 | 1 | 0 | | |
| 1982 | | 17:09:12 | | O'Donovan J & O'Donovan D | | 5 | | | | | | |
| 1983 | | 19:56:50 | | O'Donovan D & Kennedy J J | Argonauts - Cork | 1 | | 1 | | | Civilian | |
| 1985 | | 18:27:10 | | O'Donovan D & Kennedy J J | Richmond | 2 | | | 1 | | | |
| O'Donovan J | 17.1 | | | 5 | 1 | 0 | 0 | 0 | | |
| 1982 | | 17:09:12 | | O'Donovan J & O'Donovan D | | 5 | | | | | | |
| O'Geran Conor | 26.2 | | | 52 | 1 | 0 | 0 | 0 | | |
| 2002 | | 26:10:07 | | O'Geran Conor & Brett Victor | Phoenix | 52 | | | | | | |
| O'grady Geoff | 27.9 | | | 95 | 1 | 0 | 0 | 0 | | |
| 2017 | | 27:51:47 | | Durrant John & O'grady Geoff | Wey Kc | 95 | | | | | | |
| O'Grady Jon | 17.1 | | | 2 | 2 | 1 | 0 | 1 | | |
| 2025 | | 17:25:09 | | Butler Billy & O'Grady Jon | International & Runcorn | 3 | | | | 1 | Lee | |
| 2026 | | 16:46:17 | | Butler Billy & O’Grady Jon | Falcon & Runcorn | 1 | | 1 | | | Civilian,Lee | |
| O'grady Jon (Teddington) | 14.2 | | | 2 | 1 | 0 | 1 | 0 | | |
| 2024 | | 14:09:05 | | Butler Billy & O'grady Jon | Falcon & Runcorn | 2 | | | 1 | | | |
| O'hagan Stuart | 30.7 | | | 100 | 1 | 0 | 0 | 0 | | |
| 2011 | | 30:43:06 | | Hoskin Shaun & O'hagan Stuart | Royal Logistic Corps | 100 | | | | | | |
| O'Keefe P C | 29.6 | | | 18 | 1 | 0 | 0 | 0 | | |
| 1968 | | 29:36:30 | | O'Keefe P C & Noonan P | 35 Corps Engineer Regt | 18 | | | | | | |
| O'Keefe R | 20.6 | | | 1 | 1 | 1 | 0 | 0 | | |
| 1961 | | 20:37:05 | | Crook W & O'Keefe R | 1st Lancs & 1st Mddx & Richmond | 1 | | 1 | | | | |
| O'keeffe Isabel | 25.7 | | | 67 | 1 | 0 | 0 | 0 | | |
| 2016 | | 25:41:40 | | O'keeffe Isabel & O'keeffe Rosanna | Devizes | 67 | | | | | | |
| O'keeffe Rosanna | 25.7 | | | 67 | 1 | 0 | 0 | 0 | | |
| 2016 | | 25:41:40 | | O'keeffe Isabel & O'keeffe Rosanna | Devizes | 67 | | | | | | |
| O'Kelly F P | 60.0 | | | 107 | 1 | 0 | 0 | 0 | | |
| 1995 | | 60:02:37 | | Smerdon A P & O'Kelly F P | Independent | 107 | | | | | | |
| O'leary David | 24.5 | | | 27 | 1 | 0 | 0 | 0 | | |
| 2026 | | 24:31:15 | | O'leary David & Ryan Timmy | International | 27 | | | | | | |
| O'Mahony P A | 33.7 | | | 84 | 4 | 0 | 0 | 0 | | |
| 1983 | | 51:29:06 | | Hollands S J & O'Mahony P A | Phoenix Venture Scouts | 77 | | | | | | |
| 1984 | | 33:41:15 | | O'Mahony P A & Hollands S J | Phoenix Venture Scouts | 120 | | | | | | |
| 1992 | | 27:11:35 | | Flynn M & O'Mahony P A | Royal Navy | 87 | | | | | | |
| 1993 | | 22:28:25 | | Fiynn M C & O'Mahony P A | RNKA & Venture Scouts | 53 | | | | | | |
 O'Malley T | 25.6 | | | 80 | 2 | 0 | 0 | 0 | | |