Dave Koz was born on March 27, 1963 in Encino, California to Jewish parents: Norman, a dermatologist and, Audrey Koz, a pharmacist. Dave has a brother, Jeff, who is also a musician, and a sister, Roberta.
Although he is Jewish, Koz plays both Christmas and occasional Hanukkah songs at his concerts. He attended William Howard Taft High School in Woodland Hills, Los Angeles, California performing on saxophone as a member of the school jazz band. He later graduated from UCLA with a degree in mass communications in 1986, and only weeks after his graduation, decided to make a go of becoming a professional musician.
In an April 2004 interview with The Advocate, Koz came out publicly as gay.