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Ogier

British Virgin Islands, Cayman Islands +8

Ogier is an international law firm providing advice on BVI, Cayman, Guernsey, Irish, Jersey and Luxembourg law, with offices across Europe, Asia and the Middle East. Its work focuses on corporate and financial sector matters, including banking and finance, corporate, investment funds, dispute resolution, private equity, private wealth, restructuring and insolvency, and related services.

Ogletree Deakins

France

Ogletree Deakins France, founded in Paris in 2017, is a fast-growing employment law team of about 50 lawyers and professionals serving French and international employers. With offices in Paris, Nantes, Lyon and Bordeaux, the office advises employers and handles complex labor disputes across the private and public sectors as part of Ogletree Deakins' global platform.

Oh-Ebashi LPC & Partners

Japan

Oh-Ebashi LPC & Partners is a full-service Japanese law firm with over 160 attorneys and main offices in Tokyo and Osaka. Founded in Osaka in 1981, the firm operates from four locations (including Nagoya) and was the first Japanese law firm to open an office in China.

Okabe & Yamaguchi is a Japan-based law firm. The firm lists 10 lawyers and indicates services are available in Japanese and English.

Okat Law

Turkey

Okat Law is an Istanbul-based corporate commercial law firm specializing in banking, finance and capital markets, with expertise in cross-border transactions, regulatory matters, corporate/M&A, dispute resolution and tax. The firm was established by Y. Özge Okat, drawing on her 25 years of transactional and regulatory experience including service at the Capital Markets Board.

Olaniwun Ajayi (UK) LLP

England, Nigeria

Olaniwun Ajayi (UK) LLP is the London arm of Olaniwun Ajayi, a commercial law firm with a broad practice in corporate, finance, energy and natural resources and regulatory advisory matters. The firm operates as a pan‑African practice with lawyers qualified in multiple jurisdictions and offices in Nigeria and the UK.

Oldham, Li & Nie

Hong Kong

Oldham, Li & Nie is a full-service law firm operating from Hong Kong and Shanghai, founded in 1987, with over 100 staff and 43 qualified lawyers admitted in multiple jurisdictions. The firm provides family law, corporate and commercial, dispute resolution and China-focused cross-border legal services to corporate and private clients.

Olesinski & Wspolnicy

Poland

Olesinski & Wspolnicy (OW) is a modern Polish advisory firm providing legal and tax services along with analytical support, accounting and payroll consultancy, and broader business support. Founded in 2005, the firm has more than 220 specialists, serves over 400 active clients, and supports transnational projects across more than 55 countries.

Oliva Gibbs PLLC

United States

Oliva Gibbs is a national law firm focused exclusively on oil and gas law, providing strategic counsel on title, transactions, litigation, and regulatory matters to operators, mineral owners, and energy investors nationwide.

Oliveira e Olivi Advogados Associados

Brazil

Oliveira e Olivi Advogados Associados is a Brazilian law firm with 21 years of history that provides strategic, technology-enabled legal services to large national and international companies across sectors such as oil & gas, agribusiness, transportation, sugar & ethanol, printing, pulp & paper and food. The firm emphasizes innovation, predictability and ethical reliability, supported by proprietary process-management and legal-technology solutions (Salesforce-based process management, jurimetrics, a BI application and automation) to handle high-complexity matters.

Olliers

England

Olliers Solicitors is a UK criminal defence and regulatory law firm based in Manchester with facilities in London, representing individuals, businesses and organisations nationally across corporate and financial crime, regulatory breaches, serious crime, sexual and motoring offences, professional discipline, inquests and public inquiries. The firm is ranked in the Legal 500 2026 and Chambers Guide 2026, was named a Times Best Law Firm 2025 and won Crime Team of the Year at the Manchester Legal Awards in 2025.

Ollyns

France

Ollyns is a law firm based in Paris, France. The firm's Paris office is listed at 12-14 Rue Médéric, 75017 Paris, with phone +33 (1) 42 92 02 60, email contact@ollyns.com, and website ollyns.com.

Olshan Frome Wolosky LLP

United States

Olshan, a law firm based in New York, represents major businesses and entrepreneurs in significant transactions, problems and opportunities, offering innovative strategies in corporate, securities law, shareholder activism, litigation, real estate, intellectual property, bankruptcy and creditors' rights, and advertising.

Omar Al-Rasheed & Partners Law Firm

Saudi Arabia

Omar Al-Rasheed & Partners Law Firm offers a wide range of legal and consulting services in Saudi Arabia, with experience in regulatory compliance, M&A, banking, commercial transactions, and litigation. The firm has offices in Riyadh, Jeddah, and Dubai, and represents clients ranging from Saudi government entities to Fortune 100 companies.

One Asia Lawyers

Japan

One Asia Lawyers Group is a network of independent law firms providing legal advice on the laws of ASEAN countries, South Asia and Oceania. One Asia Lawyers (One Asia法律事務所) is the group's member firm in Japan and works with member firms across the region to deliver cross-border and regional legal services in areas including mergers and acquisitions, finance, real estate and employment.

Ontier

Bolivia, Chile +5

Ontier is an international law firm with offices in Bolivia, Chile, England, Italy, Mexico, Peru and Spain. The London office (Ontier LLP) is described as staffed by solicitors and barristers and the firm handles high‑profile matters across commercial litigation, international corporate and banking, insolvency, intellectual property and cryptocurrency disputes.

Ooi & Ooi

Malaysia

Ooi & Ooi is an award-winning boutique law firm based in Kuala Lumpur, Malaysia, providing strategic legal services across dispute resolution, construction, real estate, anti‑money laundering and related corporate and private client matters. The firm has received regional and national recognition for its work and client service.

Oon & Bazul LLC

Singapore

Founded in 2002, Oon & Bazul is a Singapore-based commercial law firm known for a strong international practice and experience coordinating matters across multiple jurisdictions. The firm represents clients including sovereign states, multinational corporations, financial institutions and high-net-worth individuals and emphasizes diversity, equity and inclusion.

Orak Attorneys at Law is a Turkey-based law firm with an office located in Kavaklıdere, Ankara. Contact details listed: +90 312 428 0 333 and info@ccorak.av.tr.

Orange Clover is an independent boutique law firm based in Amsterdam, Netherlands, established in March 2014. The firm focuses on corporate/M&A, finance, financial regulation and investment management, provides notarial services in these areas, and serves clients across sectors including IT, private equity/venture capital, energy, industry and manufacturing, and financial institutions.

Oraro & Company Advocates

Kenya

Oraro & Company Advocates is a full-service Kenyan law firm established in 1977 with strong capabilities in dispute resolution and corporate and commercial law. The firm advises local and international clients across multiple sectors, provides cross-jurisdictional services through its pan‑African network membership, and is regularly ranked by leading legal directories.

Orr, Dignam & Co.

Pakistan

Orr, Dignam & Co. is a long-established Pakistani law firm with fully operational offices in Karachi and Islamabad, founded in 1952 and reconstituted in 1972. The firm advises on a broad range of civil and commercial matters — including corporate and company law, project and infrastructure work, energy, banking and finance, telecommunications, maritime and aviation, arbitration and litigation — and acts for multinational clients, banks, public sector corporations and international law firms.

Orrick, Herrington & Sutcliffe LLP

China, France +8

Orrick, Herrington & Sutcliffe LLP is a global law firm focused on serving clients in the technology & innovation, energy & infrastructure, and finance sectors. The firm provides legal services including M&A, private equity, capital markets, intellectual property, dispute resolution, and regulatory compliance across multiple jurisdictions.

Orsay Avocats

France

Orsay Avocats is a French law firm based in Paris. Its Paris office is located at 13 Avenue de Friedland (75008 Paris); contact phone +33 (0) 1 56 59 88 88, email contact@orsaylaw.com, website https://www.orsaylaw.com/.