Flak was introduced to the English language in World War II to refer to the anti-aircraft fire from anti-aircraft guns, from the German Flugabwehrkanone (Flak), for "aircraft defence cannon".
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Flak may also refer to:
- Flak, intense criticism, a metaphor derived from intense anti-aircraft gunfire
- "Flak", a class of the Propaganda model advanced by Edward S. Herman and Noam Chomsky
- Flak, "flat land" or "flat sandbank", a component of Germanic language area place names, e.g. Flakfortet
- Flak jacket, protective clothing worn by soldiers and others to protect themselves from debris and shrapnel