The merger will see Collas Crill expand its global presence, adding to its Singapore, Cayman Islands, London, Guernsey and Jersey offices.
The firm will remain as Collas Crill in its current jurisdictions and trade as Collas Crill-Farara Kerins for a transitional period in the BVI.
From the Caribbean island the combined firms will offer funds, corporate and dispute resolution work.
The BVI merger follows Collas Crill's opening of its Singapore office in 2011 and the firm's merger with Charles Adams Ritchie & Duckworth (CARD) in the Cayman Islands two years ago.
Jason Romer, group managing partner at Collas Crill, said: “As Collas Crill continues to grow and expand within the offshore market, it was a natural step to cement our presence in the Caribbean, satisfying our well-established client-base.
"Many of our clients across the world have asked us to have a presence in the BVI. It is a direct response to their needs and represents an exciting development to help us to further assist our clients with their global requirements. It allows us to provide a seamless offering across all our jurisdictions."
Gerard St. C. Farara, QC, Senior Partner at Farara Kerins, said: "We are very excited to be merging with Collas Crill. The merger represents a strategic move for our firm to build on our excellent reputation and the foundations Collas Crill has made through its Cayman and Singapore offices."