Lightspeed is a physical constant.

Lightspeed may also refer to:

• Lightspeed (album), the 2010 album by Destine
• Lightspeed (film), a 2006 science fiction film
• Lightspeed (magazine), an online fantasy and science fiction magazine
• Lightspeed (Transformers), a fictional character
• Lightspeed (video game), a space simulation computer game released in 1990
• Julie Power, a Marvel Comics superhero who goes by the name Lightspeed
• "Lightspeed", a song by Dev from her album The Night The Sun Came Up

• Lightspeed (brokerage), a New York City based brokerage
• Lightspeed Systems, a company that sells content-control and security software and systems for schools
• Lightspeed Venture Partners, a venture capital firm
• Lightspeed Commerce, Canadian point-of-sale software provider

• LIGHT SPEED, the callsign of Executive Express Aviation
• Telesat Lightspeed, a low Earth orbit satellite constellation being built by Telesat

• Litespeed (disambiguation)