William Osman to Henry F C Otte - 1881 Census household returns
- William Osman to Anne Osmay
- Rachael Osmeat to John Osmer
- William Osmer to Charles Osmond
- Charles Osmond to Francis Osmond
- Francis J Osmond to Henry Osmond
- Henry Osmond to John Osmond
- John Osmond to Mary Osmond
- Mary Osmond to Samuel Osmond
- Samuel Osmond to William Osmond
- William Osmond to George Osmothery
- Richard Osmrod to James G Ost
- James W Ost to William Osten
- Caroline Ostenberg to James Ostick
- Jane Ann Ostick to Henry Ostle
- Isaac Ostle to Bryan Ostler
- Caroline Ostler to Griffiths Ostler
- Hannah Ostler to Mary Ostler
- Mary A Ostler to Henry Ostley
- Ann Ostliff to Agnes Oswald
- Agnes M Oswald to David Oswald
- David Oswald to George Oswald
- George Oswald to James J Oswald
- James M Oswald to John Oswald
- John Oswald to Peter Oswald
- Peter Oswald to Thomas Oswald
- Thomas Oswald to William P Oswald
- William Wyld Oswald to Nevitt Oswell
- Oliver Oswell to Phillip Oswick
- Robert Oswick to John Oswin
- John Oswin to William Oswin
- William Henry Oswin to John Othen
- John Othen to Robert Othick
- Samuel Othick to Dennis Otley
- Dick Otley to Mark Otley
- Martha Otley to William Otley
- William Otley to Charles Ott
- Emma Ott to Anne Ottaway
- Arthur Ottaway to Henry Ottaway
- Henry Ottaway to Mary Ottaway
- Philip Watson Ottaway to Henry F C Otte