Jan Brady - née Jan Martin, later Jan Brady-Covington (center left), portrayed by Eve Plumb in the TV series, Geri Reischl in The Brady Bunch Hour, Jennifer Elise Cox in theatrical films, and Ashley Drane in the TV movie, is the middle Brady daughter. Storylines which involve Jan often feature her jealousy of her seemingly more popular older sister Marcia, or her awkward position as the middle child. In addition, Jan is insecure about having freckles and wearing glasses, embarrassed about the fact she does not have a boyfriend (she invents a fictional boyfriend named "George Glass" in an effort to save her reputation), and concerned about her future appearance.

A typical plot line surrounding Jan would feature her attempting to carve out her niche in the family, or make a name for herself at school. In the episode "Her Sister's Shadow," in exasperation at her supposed inferiority to Marcia, she uttered the now famous catch phrase, "Marcia, Marcia, Marcia!" It was later parodied in the Brady Bunch movie and in a recurring Saturday Night Live sketch, as well as in the title of the Fanboy and Chum Chum episode "Marsha, Marsha, Marsha".