Internationalism may refer to:

• Cosmopolitanism, the view that all human ethnic groups belong to a single community based on a shared morality as opposed to communitarianism, patriotism and nationalism
• International Style, a major architectural movement that was developed in the 1920s and 1930s
• Internationalism (linguistics), loanwords that occur translingually with the same or at least similar meaning and etymology
• Internationalism (politics), a political movement that advocates a greater economic and political cooperation among nations
• Internationalism (Venezuela), a Venezuelan political party
• Internationalist–defencist schism, a split within the socialist movement between those opposed to World War I (internationalists) and those supporting their own country’s war efforts (defencists)
• Multilateralism, in international relations, multiple countries working in concert on a given issue
• Proletarian internationalism, the Marxist view of internationalism

• International (disambiguation)
• Internationalist (disambiguation)
• Internationality
• Nationalism