Blythe (pronounced "blithe" or like the 'bli' sound in "blind") is a doll created in 1972 by designer Allison Katzman with the now-defunct American toy company Kenner. Reportedly, she was modeled after drawings by Margaret Keane, similarly to many other dolls of the '60s and '70s. Her most unique and notable feature were blinkable eyes that changed color with the pull of a string attached to the back of her head. Blythe dolls were only sold for one year in the U.S. (produced in Hong Kong), during 1972. She was not very popular and faded from store shelves quickly.

Thirty years after her first release date, Blythe regained popularity. In 1997, New York TV and video producer Gina Garan was given a 1972 Kenner Blythe by a friend and began using it to practice her photographic skills. She began taking her Blythe everywhere with her and took hundreds of photos. Then, in 1999, a chance encounter with CWC's Junko Wong brought Blythe to the attention of Parco and toy executives. In 2002, Gina published her first book of Blythe photography with Chronicle Books, This is Blythe. Later that year, Hasbro (Kenner's successor) gave the rights to make Blythe dolls to Takara of Japan. Blythe was used in a television advertising campaign by the Parco department store in Japan and was an instant hit. Success in Japan led Blythe back to the U.S., where she become a niche product in a marginal market, selling largely to adults. In 2003 she was the subject in a segment on the popular VH1 special, I Love the 70s, where she was said to look like either "Barbie with elephantiasis" or "Christina Ricci" among other things. One panelist asked if she could take a doll home! In 2004, the Ashton-Drake Galleries began to produce their own Blythe replica dolls in the United States.

A vibrant Blythe subculture flourishes on the Internet, predominantly in forums and usergroups. There is a market network of hobbyist Blythe clothiers, designers, and customizers.

There are two types of Blythe dolls: the 28 cm version and the 11.2 cm "Petit Blythe." Only large dolls have color-changing eyes, which include the colors blue, green, orange, and pink (except for cases with limited-edition dolls). Newer releases of the Petit Blythe dolls have moveable eyelids and bendable bodies.

A smaller Kubrick version of Blythe also exists.

The measurements of Blythe: 4.17-2.76-3.89 (in inch) or 106-70-99 (in mm). The measurements of Petit Blythe: 1.77-1.18-16.5 (in inch) or 45-30-42 (in mm).

Unlike Barbie, Blythe does not have a boyfriend. She also does not advertise her professional life. Kenner is now owned by Hasbro.