Kaczynski or Kaczyński may refer to:
- Bogusław Kaczyński (born 1942), Polish classical music journalist
- David Kaczynski (born 1949), American activist, Theodore Kaczynski's brother
- Jarosław Kaczyński (born 1949), Polish politician, former prime minister of Poland
- Lech Kaczyński (1949–2010), Polish politician, former president of Poland, Jarosław Kaczyński's twin brother
- Maria Kaczyńska (1942–2010), Polish economist, Lech Kaczyński's wife
- Ryszard Kaczyński (born 1954), Polish politician
- Theodore Kaczynski (born 1942), American mathematician, social critic, and serial bomber, known as the Unabomber
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