Janson

What we do: Janson is a leading multidisciplinary and multilingual business law firm in Belgium, offering a comprehensive range of legal services to clients across diverse sectors including banking, finance, real estate, energy, technology, telecommunications, construction, and public law[2][7]. Our team of approximately 100 lawyers provides proactive, creative, and practical solutions tailored to the needs of both domestic and international clients, from multinational corporations and financial institutions to public authorities and non-profit organizations[1][2][5]. We are recognized for our expertise in litigation, arbitration, mergers and acquisitions, corporate law, employment, tax, and regulatory matters, ensuring that our clients receive the highest standard of legal advice and representation[2][7].

Where we are located: Janson’s headquarters is located at Rue de la Réunion 8, 7000 Mons, Belgium. The firm also maintains offices in Brussels (Chaussée de La Hulpe 187, 1170 Bruxelles) and Ghent (Congreslaan 27, 9000 Gent), strategically positioning us to serve clients throughout Belgium and beyond[6].

Short history: Founded in 1950, Janson is one of Belgium’s oldest and most respected independent law firms, with a legacy rooted in the values of its namesake, Paul Emile Janson—a prominent attorney and former Prime Minister of Belgium[1][4]. The firm was established as Belgium’s first structured law firm, pioneering a collaborative approach that bridged political and professional divides in pursuit of legal excellence[4][6]. Over seven decades, Janson has grown into a major player in the Belgian legal market, consistently praised for its quality, reliability, and international outlook[1][2].

Organization & culture: With around 100 lawyers, including 33 partners and over 60 associates, Janson fosters a culture of excellence, collaboration, and continuous learning[2][6]. Many of our partners and senior associates are actively involved in academia, teaching at university law schools and contributing to legal publications, which reflects our commitment to knowledge sharing and professional growth[2]. We value independence, integrity, and teamwork, and we maintain strong connections with top-tier international law firms, enhancing our ability to handle complex cross-border matters[2][3]. Our multilingual team—fluent in Dutch, French, English, German, and Spanish—ensures effective communication with a global clientele[1][2].

Recent developments: In 2025, Janson celebrates its 75th anniversary, marking this milestone with a special anniversary label that highlights the firm’s enduring legacy, adaptability, and commitment to innovation[1][6]. The firm continues to expand its expertise and international reach, remaining at the forefront of legal practice in Belgium and Europe[1][2].