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"