Josh Greenfeld (born 1928) is an author and screenwriter mostly known for his screenplay for the 1974 film Harry and Tonto along with Paul Mazursky, which earned them an Academy Award nomination and its star, Art Carney, the Oscar itself for Best Actor. Greenfeld also wrote Oh, God! Book II and the TV special Lovey and is the author of several books about his autistic son, Noah Greenfeld.