Kaczyński
Kaczynski or Kaczyński is a Polish-language surname. Its Lithuanian equivalent is Kačinskas.
| Language | Masculine | Feminine |
| Polish | Kaczyński | Kaczyńska |
| Lithuanian | Kačinskas | Kačinskienė Kačinskaitė |
| Russian | Качинский | Качинская |
People
- Aleksandra Kaczyńska, Polish rower
- Andrew Kaczynski, American journalist and political reporter for CNN
- Bogusław Kaczyński, Polish classical music journalist
- David Kaczynski, American activist, Theodore Kaczynski's brother
- Filip Kaczyński, Polish politician
- Jarosław Kaczyński, Polish politician, former prime minister of Poland
- Lech Kaczyński, Polish politician, former president of Poland, Jarosław Kaczyński's twin brother
- Maria Kaczyńska, Polish economist, Lech Kaczyński's wife
- Richard Kaczynski, American writer
- Ryszard Kaczyński, Polish politician
- Sophie Kaczynski, character from 2 Broke Girls, played by Jennifer Coolidge
- Stanislaus Katczinsky, All Quiet on the Western Front character
- Ted Kaczynski, American mathematician, social critic, and serial terrorist mail-bomber known as the Unabomber
- Thomas Kaczynski Jr., American politician