Robert Walter is an American keyboard player specializing in soul jazz on the Hammond B3 organ and Fender Rhodes. He is best known as a founding member of The Greyboy Allstars. Walter, splits his time between The Greyboy Allstars, his own 20th Congress, and a robust film soundtrack session career in Los Angeles.

The Greyboy Allstars are an American soul-jazz band from San Diego, California, United States, whose current members include Karl Denson on Saxophone, Robert Walter on Keys, Mike Andrews on guitar, Chris Stillwell on bass and Aaron Redfield on drums. They have released six albums to date.