Bloc may stand for:

• The Eastern Bloc Countries, a former group of countries in Europe
• Bloc Québécois, a political party in Canada
• Bloc Nacionalista Valencià, a political party in Land of Valencia
• Voting bloc, a group of voters voting together
• Bloc voting, a type of multiple-winner voting system
• Trade bloc
• Black bloc, a tactic used at protests, often by anarchist-aligned groups
• Bloc Party, a modern music group