The Office of the Solicitor General is an independent and autonomous office attached to the Department of Justice . Although the OSG is attached to the DOJ, the OSG is not a constituent unit of the DOJ. The DOJ's authority, control and supervision over the OSG are limited only to budgetary purposes.
The OSG is headed by the Solicitor General, who is the principal law officer and legal defender of the Government. He is assisted by a Legal Staff composed of at least thirty (30) Assistant Solicitors General, each heading a legal division. Each division shall consist of ten (10) lawyers and such other personnel as may be necessary for the office to effectively carry out its functions.
 Sec. 1, Executive Order No. 300, July 26, 1987.
 Sec. 4, Chapter 1, Title III, Book IV, Executive Order No. 292, July 25, 1987.
 Funa v. Agra, et al., G.R. No. 191644, February 19, 2013.
 Sec. 34, Chapter 12, Title III, Book IV, 1987 Administrative Code of the Philippines; Republic Act No. 9417, 24 July 2006.
To promote and protect the interest of the Republic of the Philippines and its people in legal proceedings and matters requiring the services of a lawyer.
To continually champion the Rule of Law in the pursuit of social justice as the People's Tribune and as counsel of the Republic of the Philippines.
Office Mandates and Functions
The OSG represents the Government of the Philippines, its agencies and instrumentalities and its officials and agents in any litigation, proceeding, investigation or matter requiring the services of lawyers. When authorized by the President or head of the office concerned, it shall also represent government owned or controlled corporations.
The Office of the Solicitor General shall discharge duties requiring the services of lawyers. It shall have the following specific powers and functions:
- Represent the Government in the Supreme Court and the Court of Appeals in all criminal proceedings; represent the Government and its officers in the Supreme Court, the Court of Appeals, and all other courts or tribunals in all civil actions and special proceedings in which the Government or any officer thereof in his official capacity is a party.
- Investigate, initiate court action, or in any manner proceed against any person, corporation or firm for the enforcement of any contract, bond, guarantee, mortgage, pledge or other collateral executed in favor of the Government. Where proceedings are to be conducted outside of the Philippines the Solicitor General may employ counsel to assist in the discharge of the aforementioned responsibilities.
- Appear in any court in any action involving the validity of any treaty, law, executive order or proclamation, rule or regulation when in his judgment his intervention is necessary or when requested by the Court.
- Appear in all proceedings involving the acquisition or loss of Philippine citizenship.
- Represent the Government in all land registration and related proceedings. Institute actions for the reversion to the Government of lands of the public domain and improvements thereon as well as lands held in violation of the Constitution.
- Prepare, upon request of the President or other proper officer of the National Government, rules and guidelines for government entities governing the preparation of contracts, making investments, undertaking of transactions, and drafting of forms or other writings needed for official use, with the end in view of facilitating their enforcement and insuring that they are entered into or prepared conformably with law and for the best interests of the public.
- Deputize, whenever in the opinion of the Solicitor General the public interest requires, any provincial or city fiscal to assist him in the performance of any function or discharge of any duty incumbent upon him, within the jurisdiction of the aforesaid provincial or city fiscal. When so deputized, the fiscal shall be under the control and supervision of the Solicitor General with regard to the conduct of the proceedings assigned to the fiscal, and he may be required to render reports or furnish information regarding the assignment.
- Deputize legal officers of government departments, bureaus, agencies and offices to assist the Solicitor General and appear or represent the Government in cased involving their respective offices, brought before the courts and exercise supervision and control over such legal Officers with respect to such cases
- Call on any department, bureau, office, agency or instrumentality of the Government for such service, assistance and cooperation as may be necessary in fulfilling its functions and responsibilities and for this purpose enlist the services of any government official or employee in the pursuit of his tasks. Departments, bureaus, agencies, offices, instrumentalities and corporations to whom the Office of the Solicitor General renders legal services are authorized to disburse funds from their sundry operating and other funds for the latter Office. For this purpose, the Solicitor General and his staff are specifically authorized to receive allowances as may be provided by the Government offices, instrumentalities and corporations concerned, in addition to their regular compensation.
- Represent, upon the instructions of the President, the Republic of the Philippines in international litigations, negotiations or conferences where the legal position of the Republic must be defended or presented.
- Act and represent the Republic and/or the people before any court, tribunal, body or commission in any matter, action or proceedings which, in his opinion affects the welfare of the people as the ends of justice may require; and
- Perform such other functions as may be provided by law.
History of OSG
Act No. 136 dated June 11, 1901, which became effective on June 6, 1901, created the position now occupied by the Solicitor General. Under Section 40 of this Act, the Attorney General, as head of the Bureau of Justice, was vested with the powers and functions of today's Solicitor General. At the time, the Solicitor General was second only to the Attorney General in the office the former would eventually head. Appropriately, Section 41 of the Act required an "officer learned in the law" to assist the Attorney General. This law specifically provided that "it should be the special duty of the Solicitor General to conduct and argue suits and appeals in the Supreme Court, in which the Philippine Government is interested."
Meanwhile, a few months after the Bureau of Justice was created, Act No. 222 was passed, establishing the Department of Finance and Justice. The Bureau of Justice was placed under the supervision of a new department. Act No. 2666 would later divide the department into a Department of Justice and a Department of Finance. Under this law, the Attorney General and Solicitor General continued to represent the Government in the Supreme Court and lower courts.
Act No. 4007 which was enacted in 1932 abolished the position of Attorney General. His functions were taken over by the Secretary of Justice. The Act also named the Solicitor General as the head of the Bureau of Justice. The Assistant Solicitor General, a position created by Act No. 683 of 1903, became second in command of the Bureau.
As a result of the rapidly burgeoning number of cases involving the Government, the Solicitor General after independence was constrained to concentrate on advocacy and court appearances. The functions which the Bureau of Justice used to have were gradually transferred to newly-created offices and divisions of the Department of Justice.
Executive Order No. 94 of 1947 renamed the Bureau of Justice as the Office of the Solicitor General. Subsequently, the legislature passed R. A. No. 335 in 1948 to confirm this change and to provide for a First Assistant Solicitor General who would be the second highest official in the Office.
A succession of laws relieved the Office of the Solicitor General of some of its burdens. Section 1660 of the old Administrative Code previously provided that the head of the Bureau of Justice "shall have general supervision and control over provincial and city fiscals (now prosecutors) and attorneys and over other prosecuting officer throughout the Philippines." The Office of Special Prosecutors, which the Solicitor General formerly headed, was later converted into a Division of Special Attorneys by R.A. No. 311 of 1948. The Office of the Government Corporate Counsel, which was headed by the Solicitor General under Executive Order No. 392 of 1950, became a separate office in the Department of Justice by virtue of R.A. No. 2327.
From a motley staff of one Solicitor General, an Assistant Solicitor General and a handful of assistant attorneys in the 1900's, the Office of the Solicitor General has grown throughout the years. In accordance with E.O No. 292, the Administrative Code of 1987, the Solicitor General was assisted by fifteen Assistant Solicitors General and more than a hundred Solicitors and Associate Solicitors, who are divided into fifteen divisions. In 2006, with the passing of Republic Act 9417 or the OSG Law, the Office has expanded to thirty (30) legal divisions with a corresponding increase in the general and administrative support personnel and provision for ample office space.