Science fiction
Some Social SF and Soft SF can be types of speculative fiction, for example utopian or dystopian stories. George Orwell's Nineteen Eighty-Four, Aldous Huxley's Brave New World and Margaret Atwood's The Handmaid's Tale, are examples. Some people think that satirical novels in fantastic settings (places) such as Gulliver's Travels by Jonathan Swift are speculative fiction.