Olswang was an international law firm headquartered in London, United Kingdom and with additional offices in Reading, Brussels, Madrid, Paris,[3] Singapore[4] and, since 2011, Munich.

The Lawyer ranked the firm 22nd largest in the UK[6][7] by worldwide turnover in 2010.

[10] The firm's main practice areas included media, technology, telecommunications, real estate, corporate, intellectual property, commercial litigation and arbitration, finance, leisure, tax, EU and competition, and employment.

[13] In common with other professional service firms, Olswang converted to a limited liability partnership status under English law with effect from 1 May 2009.

[14] Olswang brought libel actions[15] against Bill Browder on behalf of Pavel Karpov of the Russian interior ministry, over the Magnitsky story