The UK
No countries.
There is. In European countries there are several rights that the aristocracy still claims despite the Liberal Revolution in the XVIII century, like tax benefits.
There are many countries that have a constitutional aristocracy. They include the United Kingdom, The Netherlands, Japan, New Zealand and Norway.
norway
Lichtenstein.
There are those who still believe that an aristocracy is the best form of government
Aristocracy is a form of government where power is in hand of a privileged, small and ruling class. Some of the countries that were ruled by aristocracy are Netherlands, Sweden, Belgium, UK and Russia.
monarchy
a government that doesn't limit your rights
No country is ruled by its aristocracy. Aristocracy is a social class, not a governmental form. But a short list of monarchial governments include: England Sweden Denmark Norway Lichtenstein Austria Saudi Arabia Morocco
Aristocracy is a form of government in which power is vested in a minority consisting of those believed to be the best qualified. (Webster's 17th ed) The more common use is that the aristocracy is the class of people who are wealthy and who own the land. In England, Parliament includes a House of Lords, which traditionally included wealthy men who had inherited titles of nobility.
Aristocracy as a formal system of governance has largely diminished, but some countries still retain aristocratic titles and nobility without political power. Notable examples include the United Kingdom, where the peerage system exists; Spain, which has a history of noble titles; and Japan, where the imperial family holds a traditional aristocratic status. Other countries, such as Italy and the Netherlands, also have historical aristocratic classes, though their roles are largely ceremonial today.