• Opposition (astronomy), a term describing the position of a celestial body
• Opposition (chess), a term describing the position of the kings relative to each other
• Opposition proceeding, an administrative process available under some patent or trademark laws
• Opposition of the thumb

In politics

• Loyal opposition
• Opposition (politics), a party with views opposing those of the current government
• Opposition (parliamentary), a form of political opposition
• Leader of the Opposition
• Opposition (Australia)
• Official Opposition (Canada)
• Official Opposition (India)
• Opposition Front Bench (Ireland)
• Opposition (Malaysia)
• Official Opposition (New Zealand)
• Official Opposition (United Kingdom)
• Opposition Party (United States), a 19th-century movement

In music

• The Opposition, a London post-punk band
• The Opposition (Chicago), a Chicago indie band