A European microstate or European ministate is a very small sovereign state in Europe. In modern usage, it typically refers to the six smallest states in Europe by area: Andorra, Liechtenstein, Malta, Monaco, San Marino, and Vatican City (the Holy See).^[1] All except Malta and San Marino are monarchies (the Vatican City is an elective monarchy ruled by the Pope). These states trace their status back to the first millennium or the early second millennium except for Liechtenstein, created in the 17th century.

Microstates are small independent states recognised by larger states. According to the qualitative definition suggested by Zbigniew Dumieński (2014), microstates can also be viewed as "modern protected states, i.e. sovereign states that have been able to unilaterally depute certain attributes of sovereignty to larger powers in exchange for benign protection of their political and economic viability against their geographic or demographic constraints."^[2]

In line with this definition, only Andorra, Liechtenstein, Monaco, and San Marino qualify as "microstates" as only these states are sovereignties functioning in close, but voluntary, association with their respective larger neighbours. Luxembourg and Cyprus which are far larger than all the European microstates combined, nonetheless share some of these characteristics.^[3]

The European microstates are all of limited size and population. They also have limited natural resources. As a result, they have adopted special economic policies, typically involving low levels of taxation and few restrictions on external financial investment. Malta is a full member of the European Union, while the other five European microstates have obtained special relations with the European Union. Many of the microstates have also entered into a customs union with their larger neighbours to improve their economic situation (Vatican City and San Marino with Italy, Liechtenstein with Switzerland, Monaco with France). Most of them lack clearly marked borders; for example, Monaco forms a continuous metropolitan area with its neighbouring French communes (the largest being Beausoleil) and has many streets running across or along the border.

The wars of the French Revolution and the Napoleonic Wars caused the European map to be redrawn several times. A number of short-lived client republics were created, and the fall of the Holy Roman Empire gave sovereignty to each of its many surviving Kleinstaaten. The situation was not stabilised until after the Congress of Vienna in 1815. Following World War I and World War II a number of territories gained temporary status as international zones, protectorates or occupied territories. A few of them are mentioned here:

• Association football club AS Monaco, though based in Monaco, plays in the French football league system. In contrast, Malta maintains its own league system with a 14-team top division.
• Some of the European microstates are members of the Games of the Small States of Europe (GSSE); several of the island dependencies compete in the Island Games, alongside several other island dependencies from elsewhere in the world. Countries that participate at the Games of the Small States of Europe are: Andorra, Cyprus, Iceland, Liechtenstein, Luxembourg, Malta, Monaco, Montenegro and San Marino.
• Monaco (from 1959 to 1979 and 2004 to 2006), Malta (since 1971), Andorra (from 2004 to 2009), and San Marino (debut in 2008, then from 2011 onwards) are or were contestant countries of Eurovision Song Contest.

• Enclave and exclave
• Games of the Small States of Europe
• List of fictional European countries