Trades by player
- Andrew O`Brien
- Dennis O`Brien
- Doug O`Brien
- Sean O`Brien
- Shane O`Brien
- Ryan O`Byrne
- Mike O`Connell
- Buddy O`Connor
- Drew O`Connor
- Eric O`Dell
- Fred O`Donnell
- Sean O`Donnell
- Dan O`Donoghue
- Don O`Donoghue
- Gerry O`Flaherty
- Rob O`Gara
- Terry O`Malley
- Ryan O`Marra
- Brian O`Neill
- Jeff O`Neill
- Willie O`Ree
- Daniel O`Regan
- Cal O`Reilly
- Ryan O`Reilly
- Danny O`Shea
- Chris O`Sullivan
- Patrick O`Sullivan
- Adam Oates
- Russell Oatman
- Phil Obendorf
- Evan Oberg
- Chris Oddleifson
- Lyle Odelein
- Jeff Odgers
- Gino Odjick
- Gerry Odrowski
- Fredrik Oduya
- Johnny Oduya
- Jordan Oesterle
- John Ogrodnick
- Nikita Okhotyuk
- Kyle Okposo
- Roman Oksiuta
- Artur Oktyabrev
- Fredrik Olausson
- Ed Olczyk
- Jamie Oleksiak
- Steven Oleksy
- Rostislav Olesz
- Jimmy Oligny
- Harry Oliver
- Murray Oliver
- Mathieu Olivier
- Krzysztof Oliwa
- Bert Olmstead
- Fredrik Olofsson
- Gustav Olofsson
- Dylan Olsen
- Drew Olson
- Christer Olsson
- Linus Omark
- Bill Orban
- Victor Oreskovich
- Dmitri Orlov
- Brooks Orpik
- Oskar Osala
- Keith Osborne
- Mark Osborne
- Randy Osburn
- Chris Osgood
- T.J. Oshie
- Mark Osiecki
- Zack Ostapchuk
- Steve Ott
- Maxime Ouellet
- Michel Ouellet
- Ted Ouimet
- Dmitry Ovchinnikov
- Dennis Owchar
- Jordan Owens
- Nathan Oystrick
- Sandis Ozolinsh