Marval O’Farrell Mairal

Founded in 1923, Marval O’Farrell Mairal is the largest law firm in Argentina. A market leader at both local and Latin American levels, the firm has been providing sophisticated, high quality advice to international and local clients for 90 years. The firm comprises over 300 lawyers and has wide experience of international business issues and the complexities of cross-border transactions.

Our unmatched strength allows us to react quickly and to simultaneously handle large, complex and time-consuming transactions without compromising on quality. All our teams are led directly by highly experienced partners and carefully tailored to meet the specific needs of our clients. We have a strong focus on high-end corporate and finance transactions and the largest, most active litigation and arbitration practice in Argentina.
Our leading intellectual property department provides a comprehensive service and has unrivalled experience; the firm was originally founded as an intellectual property office. We are also a market leader in a wide range of other key practice areas including tax, fintech, labor and employment, competition/antitrust, energy and natural resources, administrative and public law, insurance and reinsurance, telecommunications and broadcasting as well as real estate and construction.

We also have an office in New York, providing invaluable support on US transactions. With a long history of advising multinational companies and international institutions, we have a unique understanding of the Argentine market and how to help our clients achieve their goals. Marval O'Farrell Mairal has a 90-year track record of being prepared to respond to any challenge, both in the country and in complex cross-border transactions.


Av. Leandro N. Alem 882
(C1001AAQ) Buenos Aires





Diego Fernandez

Key partner in the IT & privacy practice group. Technology expert, with 16 years’ experience. Wide range of expertise includes privacy & data protection, privacy compliance, privacy in internal investigations and at the workplace, RegTech (including Fintech, Insurtech and HealthTech), software licensing, IT agreements, IT compliance, cyber security, and criminal law in connection with technology. Regularly advises clients on IT and privacy-related matters, and also IP and IT in M&A transactions. Extensive experience advising clients on IP matters, including litigation, giving the firm the unmatched capability of providing knowledgeable advice on IP and IT under the same person. Former foreign associate in the IT & privacy group at Foley & Lardner, Chicago. Board Member of ITechLaw, co-chair of the Argentina Chapter of IAPP, President of the Privacy & M&A Committee of the Latin America Privacy Association, Board Member of the Global Privacy Law Review, member of the Technology Committee of the IBA, and the Internet Committee of the INTA.

What is the INPLP?

INPLP is a not-for-profit international network of qualified professionals providing expert counsel on legal and compliance issues relating to data privacy and associated matters. INPLP provides targeted and concise guidance, multi-jurisdictional views and practical information to address the ever-increasing and intensifying field of data protection challenges. INPLP fulfils its mission by sharing know-how, conducting joint research into data processing practices and engaging proactively in international cooperation in both the private and public sectors.