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The Supreme Court of Justice through the Constitutional Chamber will be the sole tribunal competent to declare the unconstitutionality of the laws, decrees, and regulations, in their form and content, in a general and obligatory manner, and it may do so on petition by any citizen. (Art. 183)

The Constitutional Court has duties and powers as follows:
(1) to consider and adjudicate on the constitutionality of a law or bill;
(2) to consider and adjudicate on a question regarding duties and powers of the House of Representative, the Senate, the National Assembly, the Council of Ministers or Independent Organs;
(3) others duties and powers prescribed in the Constitution.
The submission of a petition and the conditions for submitting a petition, the consideration and adjudication, the rendering of a decision, and the operation of the Court, except as prescribed by the Constitution, shall be in accordance with the Organic Act on the Procedures of the Constitutional Court. ... (Sec. 210)

(1) Subject to Subsection (4), the Supreme Court shall, on application by an authority referred to in Subsection (3), give its opinion on any question relating to the interpretation or application of any provision of a Constitutional Law, including (but without limiting the generality of that expression)any question as to the validity of a law or proposed law.
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(3) The following authorities only are entitled to make application under Subsection (1):-
(a) the Parliament; and
(b) the Head of State, acting with, and in accordance with, the advice of the National Executive Council; and
(c) the Law Officers of Papua New Guinea; and
(d) the Law Reform Commission; and
(e) the Ombudsman Commission; and
(ea) a Provincial Assembly or a Local-level Government; and
(eb) a provincial executive; and
(ec) a body established by a Constitutional Law or an Act of the Parliament specifically for the settlement of disputes between the National Government and Provincial Governments or Local-level Governments, or between Provincial Governments, or between Provincial Governments and Local-level Governments, or Local-level Governments; and
(f) the Speaker, in accordance with Section 137(3) (Acts of Indemnity).
(4) Subject to any Act of the Parliament, the Rules of Court of the Supreme Court may make provision in respect of matters relating to the jurisdiction of the Supreme Court under this section, and in particular as to-
(a) the form and contents of questions to be decided by the Court; and
(b) the provision of counsel adequate to enable full argument before the Court of any question; and
(c) cases and circumstances in which the Court may decline to give an opinion.
… (Sec. 19)

Declaration of unconstitutionality may be requested by:
a) The President of the Republic;
b) The Speaker of the National Parliament;
c) The Prosecutor-General , based on the refusal by the courts, in three concrete cases, to apply a statute deemed unconstitutional;
d) The Prime Minister;
e) One fifth of the Members of the National Parliament;
f) The Ombudsman. (Sec. 150)

The High Court has the jurisdiction in relation to the interpretation, application and enforcement of this Constitution conferred by —
(a) section 14 (Parliamentary declaration of purpose); 
(b) Part II, Division 5 (Enforcement of the Bill of Rights); and
(c) section 134 (constitutional interpretation), and otherwise by law. (Sec. 5)

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Before any ratification, the treaties are submitted by the President of the Republic, to the control of constitutionality of the High Constitutional Court.
… (Art. 137)

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VIII. 3. The restriction of the human rights recognized by this Constitution; the principles consecrated in Article 40 of it; electoral matters; the revenues and expenditures of the State; [and] national security and the organization, functioning and discipline of the permanent Armed Force[,] may not be the object of popular consultation. The Supreme Court of Justice of the Nation will decide [resolverá], prior to the convocation that the Congress of the Union realizes, concerning the constitutionality of the matter of the consultation;
… (Art. 35)

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2. The Council of Ministers presents to the Constitutional Court the international agreements which contain provisions that come in conflict with the Constitution. (Art. 180)

The Constitutional Court may be referred to [a matter] of a pleading of unconstitutionality on remand of the Supreme Court or of the Council of State, when one of the parties in the process sustains before a jurisdiction that the legislative or regulatory provision on which the outcome of the litigation depends infringes the rights and the freedoms guaranteed by the Constitution.
... (Art. 195)

1. The Constitutional Council is a sovereign public office with special jurisdiction to administer justice in matters of a legal-constitutional nature.
… (Art. 240)