Herbert Smith Freehills (HSF) is a global law firm with headquarters in London, England and Sydney, Australia. HSF has been widely acknowledged as one of the world's most elite and selective law firms, and, as of 2024, was the 33rd largest by revenue. It was formed on 1 October 2012 by a merger between the United Kingdom-based Herbert Smith founded in 1882, then a member of the Silver Circle of leading UK law firms, and Freehills founded in 1852, one of the Big Six Australian law firms.