Sharon Calahan ASC is an American cinematographer who was director of photography on the Pixar films A Bug's Life (1998), Toy Story 2 (1999), and Finding Nemo (2003), and was lighting director for Ratatouille (2007), Cars 2 (2011), and The Good Dinosaur (2015). She took part in the early rise of computer animated feature filmmaking and the acceptance of that medium as cinematography. Calahan is the first member of the American Society of Cinematographers who was invited to join on the basis of a career entirely in animated film. She was nominated, with Bill Reeves, Eben Ostby, and , for a 2000 BAFTA Award for Best Achievement in Special Visual Effects for A Bug's Life.