Counterfactual

Counterfactual may refer to:

• Counterfactual conditional, a grammatical form (which also relates to philosophy and logic)
• Counterfactual subjunctive, grammatical forms which in English are known as the past and pluperfect forms of the subjunctive mood
• Counterfactual thinking
• Counterfactual history
• Alternate history, a literary genre
• Counterfactual definiteness in quantum theory
• Counterfactual measurements in quantum theory