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70 St Mary Axe
London EC3A 8BE

電話:+44 20 7360 3600

ファックス:+44 20 7626 7937





Sidley’s office in London, its largest in Europe, has served clients in the London market since 1974. The firm gained a significant advantage in 1994 when it began offering English law advice in addition to U.S. legal advice. Having lawyers qualified to practice in both jurisdictions for 30 years has enhanced our reputation for assisting global businesses across a variety of industries. 

Sidley has received 11 practice area and 31 lawyer rankings. Client praise includes:“Sidley Austin provide impeccable service levels and responsiveness.”
Chambers UK 2024

Our London office serves as a key hub for the firm’s international and cross-border work, representing clients on a wide range of complex transactional, regulatory, and litigation matters. Sidley’s clients in London include the world’s leading financial institutions, private equity, funds, life sciences, FTSE 100, and Fortune 500 companies.

“Sidley Austin are always very helpful in complex situations.”
Chambers UK 2024


Sidley Austin LLP is a registered limited liability partnership organised under the laws of Delaware and authorised and regulated by the Solicitors Regulation Authority (SRA No. 79075). A list of the names of the London office partners of Sidley Austin LLP is open to inspection at its principal place of business, 70 St Mary Axe, London EC3A 8BE, and such persons are either solicitors, registered foreign lawyers, European lawyers or managers authorised by the SRA.

Separate partnerships, which are affiliated with one another, are responsible for the operations of Sidley Austin’s offices around the world. Further details about our partnership structure can be found here, under “Collective Designations”


We are committed to providing high-quality legal services to all our clients. If you are a client and have a complaint about our professional behaviour, the services provided to you by the London office of Sidley Austin LLP, including a complaint about an invoice, please contact the partner handling the matter or your client relationship partner. If that does not resolve your complaint, you may use our complaints procedure set out below.

Financial Services

Sidley Austin LLP is not authorised under the Financial Services and Markets Act 2000 but we are able to, in certain circumstances, offer a limited range of investment services to clients because we are authorised and regulated by the Solicitors' Regulation Authority, which has complaints and redress procedures. 

Modern Slavery Act Statement

This statement is made on behalf of the London office of Sidley Austin LLP pursuant to section 54(1) of the Modern Slavery Act 2015 and constitutes our slavery and human trafficking statement.

The Modern Slavery Act 2015 (“the Act”) requires large commercial organisations doing business in the UK to take steps to ensure that slavery and human trafficking are not taking place in their own businesses or in any of their supply chains, and to publish statements on their websites setting out the steps they have taken.

Sidley Austin LLP is committed to the constant improvement of our practices to prevent slavery and human trafficking from occurring within our business and supply chain. We expect the same high standards of our suppliers.

Diversity Statistics

For our diversity statistics, click here.