Danica Mae McKellar is an American actress, mathematics writer, and education advocate. She is best known for playing Winnie Cooper in the television series The Wonder Years.

The Wonder Years is an American coming-of-age comedy television series created by Neal Marlens and Carol Black. It ran on ABC from January 31, 1988, until May 12, 1993. The series premiered immediately after ABC's coverage of Super Bowl XXII. The series stars Fred Savage as Kevin Arnold, a teenager growing up in a suburban middle class family in the late 1960s and early 1970s. It co-stars Dan Lauria as his father Jack, Alley Mills as his mother Norma, Jason Hervey as his brother Wayne, Olivia d'Abo as his sister Karen, Josh Saviano as his best friend Paul Pfeiffer, and Danica McKellar as his girlfriend Winnie Cooper, with narration by Daniel Stern as an adult version of Kevin.