Robert David Grusin (born June 26, 1934) is an American composer, arranger, producer, jazz pianist, and band leader. He has composed many scores for feature films and television and has won numerous awards for his soundtrack and record work, including an Academy Award and 10 Grammy Awards. Grusin is also a frequent collaborator with director Sydney Pollack, scoring many of his films like Three Days of the Condor (1975), Absence of Malice (1981), Tootsie (1982), The Firm (1993), and Random Hearts (1999). In 1978, Grusin founded GRP Records with Larry Rosen, and was an early pioneer of digital recording.

Grusin was born in Littleton, Colorado, to Henri and Rosabelle (née de Poyster) Grusin. His family originates from the Gruzinsky princely line of the Bagrationi dynasty, the royal family that ruled the Kingdom of Georgia in the ninth to 19th centuries. In Slavic languages, “Grusin” is an ethnonym for Georgians.