One Fish, Two Fish, Red Fish, Blue Fish is a 1960 children's book by Dr. Seuss. It is a simple rhyming children's book designed for beginner readers. As of 2001, over six million copies of the book had been sold, placing it 13th on a list of "All-Time Bestselling Children's Books" from Publishers Weekly. The book is widely praised for its rhythmic language and imaginative characters, which help engage young readers and make early reading enjoyable and memorable. Based on a 2007 online poll, the United States' National Education Association labor union listed the book as one of its "Teachers' Top 100 Books for Children".