Channel Islands firm Carey Olsen is due to launch offices in Monaco and Zurich and is awaiting regulatory approval in Dubai.
The new offices will provide fiduciary and administrative services for clients setting up trusts and other funds.
Offshore law firms tend only to provide such services in the same jurisdiction as their main offices, but last year Jersey firm Bailhache Labesse also expanded through a tie-up with Ernst & Young in Mauritius.
Carey Olsen, which has offices in Jersey, Guernsey and Alderney, also has a pending application with the Central Bank of the United Arab Emirates to open an office in Dubai that will provide similar services.