Weider is a German surname. Notable people with the surname include:
- Ben Weider (1923–2008), co-founder of the International Federation of BodyBuilding & Fitness.
- Jim Weider, guitarist
- John Weider (born 1947), rock musician
- Joe Weider (1919–2013), Canadian bodybuilder and key developer of the profession
- Wolfgang Weider (1932–2024), German auxiliary bishop, Archbishop of Berlin
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