Excalibur may refer to:
- Excalibur, a Star Trek: New Frontier novel trilogy.
- Federation Starfleet (prime reality)
- Excalibur-class, a type of Federation starship in the late-24th century.
- USS Excalibur, a Federation starship active in the 2240s.
- USS Excalibur (NCC-1664), a Constitution-class starship.
- USS Excalibur II, a Constitution-class starship.
- USS Excalibur (NCC-2004), an Excelsior-class starship.
- USS Excalibur (NCC-26517), an Ambassador-class starship.
- USS Excalibur (NCC-26517-A), a Galaxy-class starship.
- USS Excalibur (NCC-94547), the Excalibur-class prototype.
- Federation Starfleet (alternate reality)
- Imperial Starlfeet (mirror universe)
- Khanate of Earth (alternate timeline)
- Earthfleet Starship Excalibur, an Earthfleet starship in the late-24th century.
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