Duncan Ball (born February 1941) is an American-born Australian author who has written the children's series Selby (about a talking dog named Selby who tries to keep his secret away from his owners) and Emily Eyefinger (about a girl who has an eye on her finger).

Duncan was born in February 1941 in Boston, Massachusetts, United States, and was one of three children.

In his teens, Duncan moved to Madrid, Spain where he learned to speak Spanish.

He wrote a novel for adults and later changed jobs to editor of the School Magazine at the Department of Education of New South Wales.

It is about a dog named Selby, who learned to talk while watching TV and struggles to keep his ability a secret (he must do this so his owners, the Trifles, do not put him to work around the house).