Oligarch may refer to:
Authority
- Oligarch, a member of an oligarchy, a power structure where control resides in a small number of people
- Oligarch (Kingdom of Hungary), late 13th–14th centuries
- Business oligarch, wealthy and influential magnate
- Russian oligarchs, business oligarchs in the era of Russian privatization in the 1990s
- Ukrainian oligarchs, business oligarchs after Ukrainian independence in 1991
See also
- The Oligarchs, a 2001 non-fiction book by David E. Hoffman
- Oligarch planet, hypothetical planets beyond Neptune
- Old Oligarch, author of a "Constitution of the Athenians"