Formanek (or Formánek) is a Czech and Slovak surname. It may refer to:
- Bedrich Formánek (born 1933), Slovak chess composer
- Edward W. Formanek (born 1942), U.S. mathematician and chess player
- Josef Formánek (born 1969), Czech writer, journalist, and traveler
- Michael Formanek (born 1958), U.S. jazz musician
- René Formánek (born 1975), Czech footballer
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