Spencer Nilsen (born 1961) is a video game music composer. He is best known for his soundtracks to the Sega Mega-CD versions of Batman Returns, Ecco the Dolphin, Ecco: The Tides of Time, Jurassic Park, The Adventures of Batman and Robin and The Amazing Spider-Man vs. The Kingpin as well as the North American version of Sonic CD (CD-DA Red Book audio only).

He has also worked on a number of film scores and released a new-age album titled Architects of Change in 1989.