In science fiction literature, particularly in the works of author Dan Simmons, a farcaster is a device or technology that enables instantaneous travel between distant locations within a fictional universe. This concept is prominently featured in Simmons' "Hyperion Cantos" series, where farcasters play a crucial role in shaping the narrative and the universe itself.

Farcasters operate on the principle of quantum entanglement or some other form of advanced theoretical physics that allows for the instantaneous transmission of matter or information across vast distances. They are typically depicted as gateways or portals that connect different worlds or locations, making interstellar travel and communication feasible and practical.