Castegnaro Cabinet d’avocats est situé au centre-ville de Luxembourg, capitale du Grand-Duché de Luxembourg.

Le fondateur de Castegnaro Cabinet d’avocats, Guy Castegnaro, a intégré le barreau de Luxembourg en 1994.

Après avoir exercé pendant plusieurs années la profession d'avocat, spécialisé en droit social, dans différents cabinets luxembourgeois, Guy Castegnaro décida, en 2004, de créer son propre cabinet et de centrer son activité sur le droit social, afin de répondre à la demande croissante d’une clientèle nationale et internationale pour un éventail complet de services aussi bien en matière de conseil que de contentieux.

Aujourd’hui le cabinet compte sept avocats et preste ses services juridiques en luxembourgeois, anglais, allemand, français et italien.

Les activités du cabinet couvrent tous les aspects du droit social national, européen et international, ainsi que le droit des sociétés, le droit fiscal et le droit commercial, dans la mesure où ils sont directement ou indirectement liés au droit social.

Le Legal 500 (2009) classifie Castegnaro Cabinet d'avocats parmi  les plus grands spécialistes de droit du travail au Luxembourg: "Castegnaro Cabinet d'Avocats, member of Ius Laboris is an employment boutique that draws many of its clients from the financial and investment fund sectors. The team handles individual, collective, European and criminal employment law, under the stewardship of founding partner Guy Castegnaro, who is one of the founding members of the International Employment Law Alliance Ius Laboris."

En 2008: "Castegnaro Cabinet d'Avocats, member of Ius Laboris is a very well-regarded employment boutique run by the ‘accurate, pragmatic and quick’ Guy Castegnaro. He played a key role in establishing Luxembourg’s 2006 Labour Law Code, and more recently has been working on part II of the Code. The firm draws many of its employer clients from the financial and investment funds sectors, and recently won an important client in the air freight business. Other recent highlights included advising a client on the employment aspects of two mergers, assisting an international banking client in establishing a new pension plan, and winning a number of court cases regarding protected employee terminations."

PLC Practical Law Company 2009 classifie Castegnaro Cabinet d'avocats comme "Leading law firm" en droit du travail: "Castegnaro Cabinet d'avocats is commended for its excellent labour and employment practice".

En 2009, Chambers & Partners classifie Castegnaro Cabinet d'avocats comme "Luxembourg employment law firms: Band 1": “This fully specialised outfit is undeniably a top contender for employment law. Its founder, Guy Castegnaro, is a dedicated, long-standing employment lawyer whose decision to form his own boutique in 2004 has paid dividends in a relatively short space of time. The team of six lawyers covers all aspects of human resources, ranging from individual dismissal cases to collective labour issues. The full complement of company-side services also includes employee benefits and executive compensation, social security and data protection.”