The Convention on Certain Questions Relating to the Conflict of Nationality Laws (French: Convention concernant certaines questions relatives aux conflits de lois sur la nationalité) was a League of Nations convention adopted during the League of Nations Codification Conference, 1930 in The Hague.

For example, Articles 3 to 6 relating to the provision of diplomatic protection and assistance when a person with multiple citizenship is abroad are generally followed, often named the Master Nationality Rule, despite the absence of a treaty.

This law shall be recognised by other States in so far as it is consistent with international conventions, international custom, and the principles of law generally recognised with regard to nationality.However, the Convention recognised that individual national laws without regarding the broader international scope could lead to statelessness.

Citing that acquisition and loss of nationality typically occurred by birth, minority, or marriage, the convention made proposals to counter the rise of statelessness.

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