Bangkok is home to a world-class legal sector, split between major regional firms handling complex corporate matters and specialized firms dedicated to the personal needs of the international community. The top firms for expats and foreign businesses provide multilingual services, deep expertise in Thai law, and adherence to international standards.
Based on 2025 legal rankings and recognized specialization, here are the top 5 legal service providers in Bangkok:
1. Tilleke & Gibbins (Corporate & Regional Powerhouse)
The Go-To Firm for Complex Business and Litigation
Tilleke & Gibbins is consistently ranked as a Tier 1 or “Outstanding” firm in 2025 legal guides (Chambers Asia-Pacific, Legal 500, Asialaw). They are the premier choice for large corporations and high-stakes legal matters.
- Core Strength: Corporate/M&A, Intellectual Property (IP), and Litigation/Dispute Resolution. They were named Regional Litigation Firm of the Year at the 2025 ALB SE Asia Law Awards.
- Best For: Large foreign investors, multinational corporations, and businesses requiring expertise in Foreign Business Act (FBA) compliance, BOI Promotion, and complex commercial disputes.
- Service Model: Offers unmatched depth with a large team of specialized Thai and international lawyers.
2. Baker McKenzie (Global Corporate Presence)
The International Giant for Large-Scale Investment
Baker McKenzie’s Bangkok office is integral to its global network, handling the largest and most complex cross-border transactions in Thailand. It was named Law Firm of the Year in the Thailand Law Firm Awards 2025.
- Core Strength: Large-Scale Corporate Structuring, Mergers & Acquisitions (M&A), Banking & Finance, and Tax.
- Best For: Major multinational enterprises that require a globally integrated firm for establishing, acquiring, or structuring significant investments in the region.
- Trust Factor: Provides the comprehensive resources and proven global standard of one of the world’s largest law firms.
3. Siam Legal International (Expat, Visa & Family Law Specialist)
The Dedicated One-Stop Shop for Foreign Individuals
Siam Legal is one of the most established and visible full-service law firms catering explicitly to the needs of foreign individuals, retirees, and SMEs in Bangkok and nationwide.
- Core Strength: Immigration Services (Work Permits, Retirement Visas, LTR, US/UK Visas), Family Law (Divorce, Child Custody), and Property Law (Due Diligence).
- Best For: Expats seeking transparent, fixed-fee assistance with personal legal matters, where navigating Thai bureaucracy and document legalization is key.
- Service Model: Known for dedicated, multilingual teams and a client-centered approach that simplifies complex personal legal procedures.
4. Fragomen (Corporate Immigration Pure-Play)
The World Leader in Corporate Work Permits and Global Mobility
Fragomen is a global firm that focuses exclusively on corporate immigration and global mobility. Their Bangkok office is a specialized resource for businesses with substantial international workforces.
- Core Strength: End-to-end Corporate Immigration, including inbound Work Permits, Business Visas, and compliance advisory for large-scale expatriate transfers.
- Best For: Multinational companies that need efficient, expert management of high-volume or highly complex employee immigration cases into and out of Thailand.
- Service Excellence: Provides unparalleled expertise in navigating the regulatory requirements of the Thai Immigration Bureau and Department of Labor.
5. Chandler MHM (Energy & Infrastructure Focus)
A Highly Ranked Firm for Specialized Regulatory and Project Work
Chandler MHM (formerly Chandler and Thong-Ek) is a consistently top-ranked firm, particularly strong in highly regulated sectors like energy, infrastructure, and capital markets. They celebrated 50 years of operations in 2024.
- Core Strength: Energy & Natural Resources, Infrastructure & Project Finance, and Corporate & Commercial.
- Best For: Companies involved in major infrastructure projects, energy sector investments, or those requiring high-level regulatory compliance advice.
- Trust Factor: Deep regulatory knowledge and a strong track record in complex financing and corporate structuring within these specialized sectors.
