Regionalism may refer to:

• Regionalism (art), an American realist modern art movement that was popular during the 1930s
• Regionalism, the expression of a common sense of identity and purpose combined with the creation and implementation of institutions that express a particular identity and shape collective action within a geographical region
• Regionalism (politics), a political ideology that focuses on the interests of a particular region or group of regions, whether traditional or formal
• Critical regionalism, in architecture, an approach that strives to counter placelessness and lack of identity in modern architecture by using the building's geographical context