Speculative may refer to:
- For economics usage, see Speculation
- For usage in literature, see Speculative fiction
- For philosophical usage, see Speculative philosophy and Speculative reason
- Speculative execution
- Speculative development
- Speculative poetry
- Speculative attack
- Speculative realism
- Speculative bubble
- The Speculative Society
- Speculative multithreading
- Speculative fever
- Speculative grade
- Speculative demand
- Speculative damages
- Speculative Grammarian
- Speculative art (disambiguation)
- Speculative mood
- Speculative grammarians
- Speculative Period
- Speculative Grade Liquidity
- Speculative screen play
- Speculative fire
- Speculative mathematics
- Speculative mason
- Speculative screenplay