Walter Afanasieff (born February 10, 1958) is a multiple Grammy-award-winning record producer and songwriter. He is best known for his long association with Mariah Carey, for whom he was co-producer and co-writer for several years, beginning in 1990. He won the 1999 Grammy Award in the Record of the Year category for producing “My Heart Will Go On” by Celine Dion, and the 2000 Grammy Award for Non-Classical Producer of the Year.

Afanasieff has written and produced music for many other recording artists, including Richard Marx, Mariah Carey, Whitney Houston, Thalía, Lionel Richie, Luther Vandross, George Benson, Destiny's Child, Kenny G, Michael Bolton, Toni Braxton, Darren Hayes (Savage Garden), Andrea Bocelli, Johnny Mathis, Kenny Loggins, Barbra Streisand, Christina Aguilera, Ricky Martin, Marc Anthony, Mika, Babyface, Josh Groban, Jordin Sparks, Tina Arena, Lara Fabian, and Leona Lewis.