"Lightspeed" may refer to:

• The speed of light, a physical constant
• Lightspeed (Transformers), a fictional character.
• Lightspeed (computer game), a space simulation computer game released in 1990
• Lightspeed Media Corporation, a company active in erotic modeling and internet pornography
• Lightspeed Financial, a New York City based financial company
• Power Rangers: Lightspeed Rescue, the eighth Power Rangers television program
• Lightspeed (film), a 2006 science fiction film
• Lightspeed Venture Partners, a venture capital firm
• Julie Power, a Marvel Comics superhero who goes by the name Lightspeed.
• Lightspeed Champion, a british singer

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