"Spirit Dreams Inside -Another Dream-" is the twenty-second single by L'Arc-en-Ciel, released on September 5, 2001. It was their first single of the 21st century and their last single until "Ready Steady Go" in 2004. The song debuted at number 1 on the Oricon chart and sold over 201,000 copies in its first week.
The single contains an English language b-side, "Spirit Dreams Inside", which was played during the credits of the film '. As well as appearing on the film's soundtrack, Spirit Dreams Inside was also featured on L'Arc-en-Ciel's 2004 album Smile.