Law Office of Atty. Rainier R. Mamangun

Philippines Family Law, Property Law, Commercial Law, Civil Law & Criminal Law Firm

Law Office of Atty. Rainier R. Mamangun

Unit 2304, Antel Global Corporate Center
3 Julia Vargas Avenue, Ortigas Center

Pasig City 1605

Law Office of Atty. Rainier R. Mamangun Overview

Law Office of Atty. Rainier R. Mamangun/Mamangun Law Office is a full-service law firm located in Pasig City, Philippines that offers a wide variety of legal services. Practice areas include family law such as annulment, legal separation, and child concerns, civil cases, criminal litigation, labor law, immigration, corporate law, medical malpractice, real estate and property law, and special projects.

Established in 2004, the firm is led by Rainier R. Mamangun, who has more than 15 years of legal experience, along with substantial academic and professional qualifications. He has had training with the Philippine Department of Foreign Affairs, which is valuable in current dealings and negotiations, has appeared at Congressional hearings and other meetings, and published papers on several subjects.

Mamangun Law Office offers clients a team of lawyers with extensive experience and vast knowledge in a broad range of legal concerns. The firm is dedicated to competence with concern while providing customized services that are focused around clients’ interests.

Year this Office was Established: 2004

Languages: English, Filipino.

Law Office of Atty. Rainier R. Mamangun Areas of Law

Additional Areas of Law: Annulment of Marriage; Legal Separation; Recognition of Foreign Divorce; Adoption; Legitimation; Recognition of Illegitimate Filiation; Pre-nuptial Agreement; Breach of Contract; Torts & Damages; Specific Performance; Correction of Entry; Change of Name; Settlement of Estate; Probate or Reprobate of Wills; Violence against Women & Children; Concubinage & Adultery; Estafa or Fraud; Libel or Defamation; Physical Injuries; Sexual Harassment; Labor Law; Special Visas such as SRRV, SIRV, & SVEG; Spouse or Fiancé Visa; Determination & Lifting of Blacklist Orders; Administrative & Judicial Naturalization; Company Formation; Due Diligence; Corporate Finance & Securities; Intra-Corporate Disputes; Financial Fraud; Data Privacy; Property Purchase; Transfer & Registration of Title; Reconstitution of Lost Title; Ejectment; Removal of Encumbrance; Cases against Developers & Homeowners Associations; Cases at the HSAC (formerly HLURB).

Law Office of Atty. Rainier R. Mamangun Areas of Law Description

Atty. Rainier Mamangun's expertise in family law and domestic relations covers representation and advisory services in annulment, declaration of nullity of marriage, recognition of foreign divorce, child custody, spousal and child support, adoption, and domestic abuse cases, among others. For almost two decades, he has worked on over 200 family law-related cases.

He also has extensive experience in in actions involving torts, damages, and medical malpractice cases that were resolved through either negotiations or litigation.

He handles cases involving such matters as breach of contract, torts and damages, child custody, spousal and child support, domestic or inter-country adoption, annulment, reprobate of wills, visas, passports, dual-citizenship acquisition, legal briefs or legal advisories, document preparation and contract drafting, verification of titles with the Registry of Deeds, service of summons and notices from foreign courts, and notarial service. The firm also provides prosecution and defense of bigamy, anti-violence against women and children, theft and fraud, libel or oral defamation, threats and coercion, physical injuries, violation of the electronic commerce laws, and verification of pending cases in court or the prosecutor’s office.


Rainier Mamangun Mr. Rainier R. Mamangun
Senior Partner
Business Law, Child Custody and Visitation, Child Support, Commercial Law, Corporate Law

Of Counsel

Amaryllis Huguet Ms. Amaryllis Huguet
Of Counsel
International Law


Ceyhan Angela Burog Ms. Ceyhan Angela V. Burog
Arbitration, Business Law, Business Litigation, Civil Litigation, Commercial Litigation

Clarissa Moraga Ms. Clarissa G. Moraga
Business Law, Criminal Defense, Employment, Family Law, Litigation

Jose Raphael Virtucio Mr. Jose Raphael Virtucio
Criminal Defense, Family Law, International Law, Litigation

Law Office of Atty. Rainier R. Mamangun Affiliations

  • UP Alumni Association
  • AEA - Association of European Attorneys
  • Integrated Bar of the Philippines

More Information on Law Office of Atty. Rainier R. Mamangun

About Mamangun Law Office
Philippines Full-Service Law Firm
Corporate Lawyer in the Philippines
Mamangun Law Office FAQ

Articles Published by Law Office of Atty. Rainier R. Mamangun

The Philippine Arbitration Law and the UNCITRAL Model Law

Comparative Analysis of the Philippine Arbitration Law and the UNCITRAL Model Law on International Commercial Arbitration (Part I)

Read Article

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