Oracles (synonyms: temple, seer; example toponyms: The Oracle at Delleus) are locations where priests, priestesses, seers, or others generate prophecies and foretell the future (or claim to). The word oracle may refer to either the location or the person. This power may be inherent to the person or may come to them through a god or other power. An oracle may be a temple or other religious site. They may contain altars, shrines, statues, reflecting pools, or other elements. They may be located in remote areas such as holy islands or mountaintops.

When designing an oracle consider the belief system associated with the location. Oracles may have a highly organized religious hierarchy associated with them.

Oracle may refer to either a person performing the divination or the place where it is being performed.

Alternative oracles may be fortune-tellers, psychics, or predictive algorithms.