Fethry Duck is one of Walt Disney's comic book characters. He was created by Dick Kinney and Al Hubbard and was first used in the story "The Health Nut", published on August 2, 1964. Since then he has mostly appeared in European stories.

He is the son of Eider Duck and Lulubelle Loon, and has a brother named Abner Duck. Possible year of birth 1925. He has been trying to follow an alternative style of life based on various book he reads. He is a blunderer. He occasionally works for his uncle Scrooge McDuck alongside with his cousin Donald Duck.