Alternative history may refer to a number of subjects relating to history, the chronology and study of the past. It may mean:
- Alternate history, a subgenre of speculative fiction dealing with divergences from the world's actual history
- Counterfactual history, a form of historiography which speculates on "what if" counterfactuals to actual history
- Historical revisionism, the reinterpretation of orthodox views on history or historiography
- Secret history, historical events claimed by revisionists to have been deliberately suppressed or forgotten
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