Vulcan may refer to:

• Vulcan (mythology), the god of fire, volcanoes, metalworking, and the forge in Roman mythology
  • Vulcan of the alchemists, the patron deity associated with Paracelsian alchemy

Vulcan! (1978) is a Star Trek novel by Kathleen Sky. The plot of the book was developed from an undeveloped script outline that Sky had submitted for Star Trek: The Original Series that was positively received by Gene Roddenberry but went unused because of the cancellation of the series.