Mariana Soares David


Mariana Soares David joined Morais Leitão in 2006 and became a partner in 2023. She is a member of the firm’s litigation and arbitration team.

She has a significant track record of litigation and arbitration proceedings successfully settled through highly complex multi-party negotiations.

Throughout her career, Mariana has specialised in the prevention and resolution of disputes concerning the product value chain (namely related to the negotiation and termination of agency, franchise and commercial distribution contracts, product labelling and safety, producer liability, consumer rights, e-commerce and general contractual clauses) as well as those related to environmental/ESG liability. Her articles and publications on distribution agreements are cited by Portuguese case law. 
Mariana was awarded as Product Liability Lawyer of the Year, at European level, in 2020 and 2021, by the Women in Business Law Awards. 

She also has accrued experience in class actions, agribusiness, transport of hazardous products, insurance contracts, unfair competition, as well as in the resolution of disputes arising therefrom.

Mariana is certified as mediator and mediation master advocate by the Instituto de Certificação e Formação de Mediadores Lusófonos (ICFML) and is part of the exclusive list of mediators certified by the International Mediation Institute. She is also part of the list of mediators of the Ministry of Justice.

She is part of the “ADR and Arbitration” Task Force of the International Chamber of Commerce (ICC), in representation of the ICC Portuguese delegation, and she is a member of the mediation committee of the Centro de Arbitragem Comercial.

Mariana collaborates, since 2014, with Fundação Francisco Manuel dos Santos, being responsible for an internet portal that promotes information about citizen´s rights and obligations under Portuguese law (https://www.direitosedeveres.pt/).

Certified professional trainer by the IEFP (Portuguese employment and professional training authority).

"deep technical knowledge and a global vision ."

Legal 500

“Lawyer of the Year” - Women in Business Law Awards 2021 Europe, in the category of Product Liability.


Law Degree (Nova Law School, 2006). Update Course in Portuguese Arbitration (Nova Law School, 2012). Course on Commercial Mediation & Mediation Advocacy (Nova Law School, Laboratório RAL and ACL, 2012).


Portuguese, English (CPE), French and Spanish.


Portuguese Bar Association (admitted in 2009).

Mariana Soares David