Lawyers Brussels Bar Association (NL)
- Silvia Nys
- Steven Nysten
- Jana Viktoria Nysten
- Bernard O'connor
- Stefan Odeurs
- Ursula O'dwyer
- Tone Oeyen
- Frederik Offermans
- Maxwell Ogumula
- Michael Okkonen
- Ronke Olaye
- Michael Olislaegers
- Siegfried Omanukwue
- Steven Ongena
- Kevin Ongenae
- Ivo Onkelinx
- Goedele Ooms
- Alexandre Ooms
- Gerrit Oosterhuis
- Olivia Oosterlynck
