International sanctions are measures that can be used by individual countries or multilateral and regional organizations against other states or organizations. These decisions principally include the temporary imposition on a target of economic, trade, diplomatic, cultural or other restrictions (sanctions measures).

According to Chapter VII of the United Nations Charter, only the UN Security Council has a mandate by the international community to apply sanctions (Article 41) that must be complied with by all UN member states (Article 2,2). They serve as the international community's most powerful peaceful means to prevent threats to international peace and security or to settle them. Sanctions do not include the use of military force. However, if sanctions do not lead to the diplomatic settlement of a conflict, the use of force can be authorized by the Security Council separately under Article 42.

UN sanctions should not be confused with unilateral sanctions that are imposed by individual countries in furtherance of their strategic interests, which is a form of economic warfare. Typically intended as strong economic coercion, measures applied under unilateral sanctions can range between coercive diplomatic efforts, economic warfare, or as preludes to war.

For the first 45 years of the United Nations' history, sanctions were only imposed twice: once against Rhodesia in 1966 and then against South Africa in 1977. From 1991, there was a sharp increase in their usage. The UN voted for sanctions twelve times in the 1990s alone. According to Thomas G. Weiss, the soar in sanctions can be attributed to the shift in attitudes as a consequence of the end of the Cold War, where there was a "newfound willingness" from UN member nations to "intrude in issues that were once off-limits".

There are several types of sanctions.

Economic sanctions are distinguished from trade sanctions, which are applied for purely economic reasons, and typically take the form of tariffs or similar measures, rather than bans on trade.

Economic sanctions can range from trade barriers, tariffs, and restrictions on financial transactions to a full naval blockade of the target's ports in an effort to block imported goods. The objective of the sanctioning country is to impose significant costs on the target country to coerce a policy change or attain a specific action from the target government. However, the effectiveness of economic sanctions has been challenged, as some believe their harsh impacts can cause more harm to the general population than to the target regimes they are designed to hurt.

Diplomatic sanctions are political measures taken to express disapproval or displeasure at a certain action through diplomatic and political means, rather than affecting economic or military relations. Measures include limitations or cancellations of high-level government visits or expelling or withdrawing diplomatic missions or staff.