Largest law firms
- Justice Canada 1,734
- Borden Ladner Gervais LLP 1,062
- Crown Attorney's Office 990
- Fasken Martineau DuMoulin LLP 964
- Norton Rose Fulbright Canada LLP 897
- Blake Cassels & Graydon LLP 822
- Stikeman Elliott LLP 807
- Miller Thomson LLP 803
- Provincial Court 789
- McCarthy Tetrault LLP 681
- Bennett Jones LLP 653
- Gowling WLG (Canada) LLP 635
- Public Prosecution Service of Canada 569
- Osler Hoskin & Harcourt LLP 510
- Court of Quebec 510
- Torys LLP 501
- McMillan LLP 494
- Superior Court of Justice 480
- Legal Aid Quebec 455
- Dentons Canada LLP 452
All law firms A–Z
452 firms starting with O
- O'Blenis Law 1
- O'Blenis R. E. 1
- O'Boyle Law 1
- O'Brien 8
- O'Brien & Skrtich 1
- O'Brien Anthony White 6
- O'Brien Balka Elrick & Khehra 3
- O'Brien David G. 1
- O'Brien Devlin MacLeod 3
- O'Brien Jacklin Sulman 4
- O'Brien James M. 1
- O'Brien Michael D. R. 1
- O'Brien Peter R. 1
- O'Brien Richard P. 1
- O'Brien White 1
- O'Connell B. Ettie 1
- O'Connell Law Office 1
- O'Connor & Gold 2
- O'Connor Christopher M. R. 1
- O'Connor Daniel F. 1
- O'Connor David F. 1
- O'Connor Fergus J. (Chip) 1
- O'Connor Fergus J. (Chip) (Listing for Law Clerks) 1
- O'Connor MacLeod Hanna LLP 32
- O'Connor Richardson Professional Corporation 3
- O'Connor T. G. 1
- O'Connor Zanardo 2
- O'Connor Zanardo (Listing for Law Clerks) 1
- O'Dea Earle 21
- O'Donnell Brinac Law Professional Corp. 1
- O'Donnell John V. 1
- O'Donnell Law 1
- O'Donnell Marie (Tracey) E. 1
- O'Donnell Robertson & Sanfilippo 3
- O'Donnell Robertson & Partners 14
- O'Donnell Robertson & Sanfilippo (Listing for Law Clerks) 5
- O'Donoghue J. John Professional Corporation 1
- O'Donohue & O'Donohue 1
- O'Farrell H. Elizabeth MacKay 1
- O'Fee Law 1
- O'Flaherty Wells Law 1
- O'Flynn Weese LLP 13
- O'Flynn Weese LLP (Listing for Law Clerks) 2
- O'Grady Kathleen 1
- O'Halloran William C. 1
- O'Hara Law 1
- O'Hearn Michael P. 1
- O'Kane John L. Professional Corporation 1
- O'Keefe Sullivan Law 1
- O'Keefe Susan M. 1
- O'Keefe William Law Office 2
- O'Laughlin Gregory 1
- O'Leary Deborah M. 1
- O'Mahony Stephanie Peninsula Law Group 2
- O'Malley Thomas C. 1
- O'Marra & Elliott 3
- O'Meara Michael & Company 1
- O'Neil Dunn LLP 1
- O'Neil Kathleen G. Arbitrator & Mediator 1
- O'Neil Law Offices 1
- O'Neill Associates 6
- O'Neill Deloras Mediation Services Inc. 1
- O'Neill DeLorenzi Mendes Nanne 7
- O'Neill Law LLP (Northwest Law Group) 1
- O'Neill Melanie J. Family Law 1
- O'Neill Moon Quedado LLP 3
- O'Neill Rozenberg 1
- O'Reilly & Associes 8
- O'Reilly Law Office 2
- O'Reilly Miles D. 1
- O'Reilly Moll & Mian 3
- O'Shanter Development Company Ltd. 1
- O'Shaughnessy Criminal Law Practice 1
- O'Shaughnessy Michael J. 1
- O'Sullivan Estate Lawyers LLP 6
- O'Sullivan Estate Lawyers Professional Corporation 3
- O'Sullivan Estate Lawyers Professional Corporation (Listing for Law Clerks) 1
- O'Toole Advocacy & Litigation 1
- O'Toole J. Shawn 1
- o/a Renu S. Prithipaul Professional Corporation 1
- Oak Bay Law 1
- Oak Law Firm The 1
- Oak Law Professional Corporation 1
- Oake David 1
- Oakes Gregory A. 1
- Oakley & Oakley Professional Corporation 2
- Oakley Family Law 1
- Oakley Law 1
- Oakville Corporation of the Town of 7
- Oakville Corporation of the Town of (Listing for Law Clerks) 1
- Oatley Vigmond LLP 25
- Oatley Vigmond Personal Injury Lawyers LLP 6
- OB Law Chambers 2
- Obelysk Inc. 1
- Obirek Ronald J. 1
- Obouhov Yaroslav 1
- Obradovich Law 1
- Ocana Law Group 2
- Occhiuto Maurizio 2
- Occupational Health Clinics For Ontario Workers 1
- Ocean Nutrition Canada Ltd. 1
- Oceanside Geomatics Land Surveying Ltd. 1
- Ocrane Law Office 2
- Octaform 1
- Octagon Capital Corporation 1
- Oddleifson & Kaup 2
- Odeleye Richard Law Office 1
- Odetoyinbo Law Office 1
- Odetoyinbo LLP 1
- Odette Rwigamba Law Office 1
- Odinga Law 1
- Odishaw & Guido 4
- Odorjan Dennis Law Firm 1
- Oehm Michael L. Professional Corporation 1
- Office de la Protection du Consonnateur 1
- Office des Personnes Handicapees du Quebec 1
- Office municipal d'habitation de Montreal 1
- Office of Aboriginal Affairs 1
- Office of Arbitration (Dispute Resolution Services) 7
- Office of Human Resources 2
- Office of the Attorney General 3
- Office of the Auditor General 8
- Office of the Auditor General of Alberta 1
- Office of the Auditor General of BC 3
- Office of the Auditor General of New Brunswick 1
- Office of the Chief Coroner 2
- Office of the Chief Electoral Officer 8
- Office of the Chief Medical Examiner 9
- Office of the Child and Youth Advocate 2
- Office of the Children's Lawyer 1
- Office of the Director of Residential Rental Property 1
- Office of the Executive Council 2
- Office of the Fire Commissioner 1
- Office of the Fire Marshal 8
- Office of the Human Rights Commissioner 1
- Office of the Information & Privacy Commissioner 5
- Office of the Information and Privacy Commissioner 1
- Office of the Information and Privacy Commissioner of Ontario 1
- Office of the Judge Advocate General 7
- Office of the Mining and Lands Commissioner 1
- Office of the Official Opposition 5
- Office of the Ombudsman 9
- Office of the Ombudsperson 1
- Office of the Parliamentary Budget Officer 1
- Office of the Premier 40
- Office of the Privacy Commissioner of Canada 1
- Office of the Representative for Children & Youth 1
- Office of the Superintendent of Bankruptcy 1
- Office of the Superintendent of Financial Institutions 2
- Office of the Superintendent of Insurance 14
- Office of the Superintendent of Insurance of NT & NU 1
- Office of the Superintendent of Insurance of NU 2
- Office of the Superintendent of Pensions 2
- Office of the Superintendent of Real Estate 2
- Office of the Umpire 1
- Office of the University Counsel 1
- Official Languages Office of the Commissioner of 7
- Official Opposition Office of the 1
- Offman Raby 1
- Ofori Law 1
- OGILVIE LLP 56
- Ogletree Deakins International LLP 8
- Ogo Ebubechukwu Law Office 1
- Oguntunde Mosun Law Office 1
- Ohanessian Vahe Law Office 1
- Ohler Law Firm 1
- Oien Mediation + Family Law 1
- Oien Mediation and Family Law 1
- Oiknine Maurice 1
- Oilers Entertainment Group 1
- Oiye Henderson 3
- Okanagan Court Reporters 1
- Okebugwu U. Law Firm 1
- Okell & Weisman 2
- Okell & Weisman (Listing for Law Clerks) 2
- Okimaw Law 3
- Okotoks Law 2
- Okpala Law Offices Professional Corporation 1
- OKT LLP 1
- Okubo Miyako 1
- Ola Oshodi Law 1
- Oladokun Kolade Law Corporation 1
- Olah George D. 1
- Oland & Company 2
- Olar Lavinia M. Professional Corporation 1
- OLAR LAW 1
- Olchowy James R. 1
- Old City Quarter Law Office 1
- Old House Law 2
- Oldfield Greaves D'Agostino & Scriven 4
- Oldham Law Firm a Professional Corporation 5
- Oldham Law Firm a Professional Corporation (Listing for Law Clerks) 1
- Olearnek Kirk W. 1
- Oleniuk Carole Law Office of 1
- Olenski John Z. 1
- Olesen Law Office 1
- Olesky Robyn 1
- Olesky Ronald L. 1
- Olibris Jean D. Law Office 1
- Oligny & Jacques 1
- Olij & Faber 2
- Olij Harold Professional Corporation 1
- Olive Waller Zinkhan & Waller LLP 27
- Oliveira Michael B. 1
- Oliver & Co. 6
- Oliver Dunbar Annabelle G. 1
- Oliver Eden M. Professional Corporation 1
- Oliver Laura E. 1
- Oliver Litigation 1
- Olivier Kaade 1
- Olkovich Edward 1
- Ollek Sucha S. 1
- Ollerhead Virginia G. 1
- Ollip P.C. 4
- Ollson Elizabeth I. 1
- Olmsted E. Bruce 1
- Ololade Law Office 1
- Olschewski & Davie 11
- Olschewski & Feuer Law Office 3
- Olsen & Associates Land Surveying Ltd. 1
- Olsen & Associates Land Surveyors Ltd. 1
- Olsen Family Law 1
- Olsen Law 3
- Olsen Law (Listing for Law Clerks) 1
- Olsen Law Office 1
- Olsen Murray K. 1
- Olson & Company 2
- Olson Law 1
- Olson Lemons LLP 4
- Olthuis Kleer Townshend Barristers and Solicitors 1
- Olthuis Kleer Townshend LLP 40
- Olwedo Law 1
- Ombuds-Mediation 1
- Ombudsman for Banking Services & Investments 6
- Ombudsman Office of The 49
- Ombudsman Saskatchewan 5
- Ombudsperson Office of The 1
- OMERS Administration Corporation 15
- OMERS Administration Corporation (Listing for Law Clerks) 6
- OMERS Capital Markets 1
- OMERS Private Equity 3
- OMERS Private Markets-OMERS Infrastructure 1
- Omni Companies 1
- Omni Law Group 2
- Omni Law Professional Corporation 1
- Omnicom Canada Corp. (Listing for Law Clerks) 1
- Omonuwa Law Office 1
- Omura Robert K. 1
- Omware Julius Law Office of 1
- Omware Julius Law Office of (Listing for Law Clerks) 1
- Onderwater Land Surveying Ltd. 3
- One Way Path Legal Services 1
- Onex Corporation 1
- Onischuk Laura A. 1
- Only Family Matters 1
- Only Immigration 1
- Onni Group 1
- OnPoint Legal Research Law Corp. 1
- OnPoint Legal Research Law Corporation 4
- Ontario Aboriginal HIV/Aids Strategy 1
- Ontario Civilian Police Commission 2
- Ontario Clean Water Agency 3
- Ontario College of Social Workers & Social Service Workers 1
- Ontario College Of Teachers 2
- Ontario College of Trades 1
- Ontario Court of Justice 439
- Ontario Energy Board 14
- Ontario English Catholic Teachers Association 3
- Ontario Financing Authority 5
- Ontario Highway Transport Board 2
- Ontario Human Rights Commission 14
- Ontario Judicial Council and Justices of the Peace Review Council 1
- Ontario Justice Education Network 11
- Ontario Labour Relations Board 18
- Ontario Lottery & Gaming Corporation 11
- Ontario Motor Vehicle Industry Council 1
- Ontario Motor Vehicle Industry Council (Listing for Law Clerks) 2
- Ontario Municipal Board 10
- Ontario Northland Transportation Commission 3
- Ontario Nurses' Association 11
- Ontario Parole Board 2
- Ontario Pension Board 1
- Ontario Power Generation Inc. 33
- Ontario Principals' Council 3
- Ontario Provincial Police 5
- Ontario Provincial Police Association 5
- Ontario Public Service Employees Union 4
- Ontario Racing Commission 2
- Ontario Real Estate Association 2
- Ontario Realty Corporation 6
- Ontario Review Board 1
- Ontario School Boards' Insurance Exchange 4
- Ontario Science Centre 1
- Ontario Secondary School Teachers' Federation 1
- Ontario Securities Commission 129
- Ontario Securities Commission (Listing for Law Clerks) 7
- Ontario Superior Court of Justice 1
- Ontario Teachers' Pension Plan 1
- Ontario Teachers' Pension Plan Board 11
- Ontario Teachers' Pension Plan Board (Listing for Law Clerks) 3
- Ontario Trial Lawyers Association 3
- Onyett Marsha Professional Corporation 1
- Onyx Law Group 4
- Oosthuysen Lona & Co. 1
- Opalinski Law 2
- Opara Law Professional Corporation 1
- Open Door Law Corporation 1
- Open Door Law Corporation The 1
- Open Text Corporation 2
- Opolko John E. 1
- Opportunities NB 2
- OPSEU Pension Trust 7
- Optiva Inc. (Listing for Law Clerks) 1
- Opus Canada 1
- Opus International Consultants (Canada) Limited 1
- Opus Legal LLP 1
- Or Karen Y. M. Law Office of 1
- Orazietti Kwolek Walz 1
- Orazietti Walz Poitras 4
- Orbach Katzman & Herschorn 2
- Orbite Aluminae Inc. 1
- Orbus Pharma Incorporated 1
- Orchard & Company 7
- Ordon Law Professional Corporation 1
- Ordre des Acupuncteurs du Quebec 1
- Ordre des infirmieres & infirmiers auxiliaires du Quebec 1
- Ordre des infirmieres & infirmiers du Quebec 1
- Ordre des Optometristes du Quebec 1
- Ordre Des Technologues Imagerie Medicale et en Radio-Oncologie Du Quebec 1
- Ordre Professionnel des Technologistes Medicaux du Quebec 1
- Oreck Karby 6
- Orendorff & Associates 5
- Orenstein & Associates 3
- Orenstein Ronald I. 1
- Organisme d'autoreglementation du courtage immobilier du Quebec 19
- Origin Law Group 7
- Orion Capital Corporation 1
- Orkin Law Office 1
- Orkin Mark M. 1
- Orlando & Hicks 1
- Orlando Corporation 5
- Orle Bargen Davidson LLP 1
- Orle Davidson Giesbrecht Bargen 5
- Orlowski Law Office 1
- Orman David S. 1
- Orme James W. 1
- Ormiston Suzanne 1
- Ormston List Frawley LLP 11
- Ormston List Frawley LLP (Listing for Law Clerks) 1
- Ornge 1
- Ornge Global Corporate Services Inc. 1
- Orr Cabot Crosbie Oley Law 2
- Orr W. Glen 1
- Orris Glen 1
- Orstad Law 1
- Ortega Jarvis Y. 1
- Ortega Law Office 1
- Osanic Philip M. 1
- OSBIE (Listing for Law Clerks) 1
- Osborne Cane Trial Lawyers 2
- Osborne Coulter A. 1
- Osborne Law Group 1
- Osborne Margo 2
- Osborne Village Law Group 3
- Oscapella Eugene L. 1
- Osgoode Hall Law School of York University 124
- Oshawa City of 6
- Oshry & Company 4
- Osler Hoskin & Harcourt LLP 510
- Osler Hoskin & Harcourt S.E.N.C.R.L.s.r.l. 95
- Osler Hoskin & Harcourt LLP (Listing for Law Clerks) 31
- Osmak Orest J. 1
- Osman & Company 3
- OSMOW'S INC. 1
- Osseiran Marwan H. 1
- Ossip Professional Corporation 1
- Ostara Nutrient Recovery Technologies Inc. 1
- Osten & Osten 1
- Oster Wolfman LLP 3
- Ostiguy Jacques 1
- Ostreicher Stephanie 1
- Ostroski Law Professional Corporation 2
- Osuji & Smith Lawyers 3
- Oswald Patrick W. T. C. 1
- Oti Ngozi A. 1
- Otis & Korman 1
- Otis Group of Companies 1
- Ottawa Aviation Services 1
- Ottawa City of 24
- Ottawa Community Housing 1
- Ottawa International Airport Authority 1
- Ottawa Police Service 2
- Ottawa Rental and Supply Ltd. 1
- Ottawa South Notary 1
- Ottawa West Family Law 1
- Ottawa-Carleton District School Board 1
- Ottenheimer Baker 18
- Ottewell & Lynn 3
- Ouanounou Samy 1
- Ouchi Seiko 1
- Ouellet Jean-Jacques 1
- Ouellet Jean-Pierre 1
- Ouellet Nadon & Associees 6
- Ouellet Nadon Cyr de Merchant Bernstein Cousineau Palardy Gagnon Tremblay Leduc Denis Binsse-Masse Fortin-Legris 11
- Ouellet Roger 1
- Ouellet Stephane 1
- Ouellet Sylvie 1
- Ouellet Theriault & Tremblay 3
- Ouellette & Tremblay Lawyers 1
- Ouellette Christian S. 1
- Ouellette Court Reporting Services 1
- Ouellette Mathieu 1
- Ouellette Micheline 1
- Ouellette Rice 2
- Oughtred Wendy E. 1
- Ouimet Sylvain 1
- Ounapuu Toomas 1
- Outhouse James L. 1
- Outset Law 1
- Ovenden & Ovenden 2
- Overacker Traci C. 1
- Overall Grimes 1
- Overholt Law 2
- Overholt Law Corporation 5
- Overland LLP 4
- Overmeyer Law 1
- Overwaitea Food Group 3
- Oviatt Slader E. 1
- Owen & Company 2
- Owen & Associates Law Professional Corporation 4
- Owen & Morrison 2
- Owen Bird Law Corporation 62
- Owen Harris-Lowe Professional Corporation 1
- Owen Katherine J. 1
- Owen Law 5
- Owen Wigderson Barrister 1
- Owens Michael W. Legal PC Ltd. 1
- Owens Wright LLP 24
- Owens Wright LLP (Listing for Law Clerks) 14
- Owoh Law 1
- Owusu Osei Yaw 1
- Oxford Properties Group 9
- Oxford Properties Group Inc. 14
- Oxford Properties Group Inc. (Listing for Law Clerks) 3
- Oyen Wiggs Green & Mutala LLP 23
- Oyenubi Adeyinka 1
- Oyenubi Law Professional Corporation 1
- Ozerna Family Law 2
- Oziel Law 1
- Ozirny Law Firm 1
- Ozon Eugene R. 1
- O’Brien Balka & Khehra 1
