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(1) The Constitutional Court pronounces judgment on the unconstitutionality
1. of laws
a) on application of a court;
b) ex officio in so far as he will have to apply such a law in a suit pending before him;
c) on application by a person who alleges to have infringement of his rights directly by unconstitutionality, if the ordinance has become effective without a judicial decision having been rendered or a ruling having been rendered has become effective for this person;
d) on application by a person who, as a party in a legal matter that has been decided by a court of justice of first instance, alleges infringement of his rights because of the application of an unconstitutional law, on the occasion of an appeal filed against that decision;
(2) of federal laws also on application by a Provincial Government, a third of the members of the National Council or a third of the members of the Federal Council.
(3) of provincial legislation also at the request of the Federal Government or, if the constitutional law of a province so provides, at the request of a third of the members of the Provincial Parliament.
… (Art. 140)

A Land law may assign the decision of constitutional disputes within a Land to the Federal Constitutional Court, and the final decision in matters involving the application of Land law to the supreme courts specified in paragraph (1) of Article 95. (Art. 99)

(1) The Federal Constitutional Court shall rule:
1. on the interpretation of this Basic Law in the event of disputes concerning the extent of the rights and duties of a supreme federal body or of other parties vested with rights of their own by this Basic Law or by the rules of procedure of a supreme federal body;
2. in the event of disagreements or doubts concerning the formal or substantive compatibility of federal law or Land law with this Basic Law, or the compatibility of Land law with other federal law, on application of the Federal Government, of a Land government, or of one fourth of the Members of the Bundestag;
2a. in the event of disagreements whether a law meets the requirements of paragraph (2) of Article 72, on application of the Bundesrat or of the government or legislature of a Land;
3. in the event of disagreements concerning the rights and duties of the Federation and the Länder, especially in the execution of federal law by the Länder and in the exercise of federal oversight;
4. on other disputes involving public law between the Federation and the Länder, between different Länder, or within a Land, unless there is recourse to another court;
4a. on constitutional complaints, which may be filed by any person alleging that one of his basic rights or one of his rights under paragraph (4) of Article 20 or under Article 33, 38, 101, 103 or 104 has been infringed by public authority;
4b. on constitutional complaints filed by municipalities or associations of municipalities on the ground that their right to self-government under Article 28 has been infringed by a law; in the case of infringement by a Land law, however, only if the law cannot be challenged in the constitutional court of the Land;
4c. on complaints of associations against their non-recognition as party for the election to the German Federal Assembly;
5. in the other instances provided for in this Basic Law.
(2) At the request of the Bundesrat, a Land government or the parliamentary assembly of a Land, the Federal Constitutional Court shall also rule whether in cases falling under paragraph (4) of Article 72 the need for a regulation by federal law does not exist any longer or whether in the cases referred to in clause 1 of paragraph (2) of Article 125a federal law could not be enacted any longer. The Court’s determination that the need has ceased to exist or that federal law could no longer be enacted substitutes a federal law according to paragraph (4) of Article 72 or clause 2 of paragraph (2) of Article 125a. A request under the first sentence is admissible only if a bill falling under paragraph (4) of Article 72 or the second sentence of paragraph (2) of Article 125a has been rejected by the German Bundestag or if it has not been considered and determined upon within one year, or if a similar bill has been rejected by the Bundesrat.
(3) The Federal Constitutional Court shall also rule on such other matters as shall be assigned to it by a federal law. (Art. 93)

1 Access to the Federal Supreme Court is guaranteed by law.
2 For disputes that do not relate to a legal issue of fundamental importance, the law may stipulate a threshold for the amount in dispute.
3 The law may exclude access to the Federal Supreme Court in relation to specific matters.
4 The law may provide for a simplified procedure for appeals that are manifestly unfounded. (Art. 191)

There is for all Belgium a Constitutional Court, the composition, competences and functioning of which are established by the law.
This Court rules by means of judgments on:
1° those conflicts referred to in Article 141;
2° the violation of Articles 10, 11 and 24 by a law, a federate law or a rule as referred to in Article 134;
3° the violation of constitutional articles that the law determines by a law, a federate law or by a rule as referred to in Article 134.
A matter may be referred to the Court by any authority designated by the law, by any person that can prove an interest or, pre-judicially, by any court.
The Court pronounces by a ruling, under the conditions and according to the terms specified by the law, on every referendum described in Article 39bis before it is organised.
In the cases, under the conditions and according to the terms that it specifies, the law can give the Court competence to pronounce by a judgment on appeals lodged against decisions made by legislative assemblies or bodies thereof regarding the control of electoral expenditure incurred in the elections for the House of Representatives.
… (Art. 142)

1 The Federal Supreme Court hears disputes concerning violations of:
a. federal law;
b. international law;
c. inter-cantonal law;
d. cantonal constitutional rights;
e. the autonomy of the communes and other cantonal guarantees in favour of public law corporations;
f. federal and cantonal provisions on political rights.
2 It hears disputes between the Confederation and Cantons or between Cantons.
3 The jurisdiction of the Federal Supreme Court may be extended by law.
4 Acts of the Federal Assembly or the Federal Council may not be challenged in the Federal Supreme Court. Exceptions may be provided for by law. (Art. 189)

(1) The Constitutional Court pronounces on rulings by an administrative court in so far as the appellant alleges an infringement by the ruling of a constitutionally guaranteed right or on the score of an ordinance that lacks a basis in law, an alike proclamation of the republication of a law (treaty), an unconstitutional law, or an unlawful treaty.
… (Art. 144)

1) A Constitutional Court shall be established by way of a specific law as a court of public law to protect the rights guaranteed by the Constitution, to decide in conflicts of jurisdiction between the Courts and the administrative authorities, and to act as a disciplinary court for the Ministers.
2) The Constitutional Court shall also have jurisdiction to review the constitutionality of laws and international treaties and the legality of Government ordinances; in such matters, it may declare their annulment. Finally, it shall also act as an electoral tribunal. (Art. 104)

The Constitutional Court pronounces whether state treaties are unlawful. Art. 140 shall apply to political, to law-modifying and to law-amending state treaties and to state treaties modifying the Treaty basis of the European Union, Art. 139 to all other state treaties with the following proviso,
... (Art. 140a)

(1) If a court concludes that a law on whose validity its decision depends is unconstitutional, the proceedings shall be stayed, and a decision shall be obtained from the Land court with jurisdiction over constitutional disputes where the constitution of a Land is held to be violated, or from the Federal Constitutional Court where this Basic Law is held to be violated. This provision shall also apply where the Basic Law is held to be violated by Land law and where a Land law is held to be incompatible with a federal law.
(2) If, in the course of litigation, doubt exists whether a rule of international law is an integral part of federal law and whether it directly creates rights and duties for the individual (Article 25), the court shall obtain a decision from the Federal Constitutional Court.
(3) If the constitutional court of a Land, in interpreting this Basic Law, proposes to deviate from a decision of the Federal Constitutional Court or of the constitutional court of another Land, it shall obtain a decision from the Federal Constitutional Court. (Art. 100)