Dr. Roj Nemenuh Sarton (—4721) is a character from Isaac Asimov's Robot series.

Dr. Sarton is an Auroran roboticist who, together with Dr. Han Fastolfe, developed the techniques to build humaniform robots. Their first humaniform robot R. Daneel Olivaw was created in Sarton's image. Their second robot is R. Jander Panell.

He is murdered in Spacetown on Earth by the Police Commissioner Julius Enderby who mistakes him for R. Daneel Olivaw and hires Elijah Baley and Daneel for the investigation, hoping he can prevent them from uncovering his doing.