Robyn Charles Miller is an American video game designer who is the co-founder of Cyan Worlds with brother Rand Miller. He served as co-designer of the popular computer game Myst, which held the title of best-selling computer game from its release in 1993 until the release of The Sims seven years later. He also co-directed and co-lead designed the sequel to Myst, Riven, which was the best-selling computer game of its year of release, 1997. Miller composed and performed the soundtracks to both games. He also acted in Myst, portraying one of the antagonists, Sirrus. He co-wrote the first Myst novel, The Book of Atrus.

Cyan, Inc., also known as Cyan Worlds, Inc., is an American video game developer and publisher based in Mead, Washington. Founded as Cyan Productions by brothers Rand and Robyn Miller in 1987, the company created the Myst series.