Chelsea Cain is an American novelist and columnist.

Cain spent her early childhood on a hippie commune outside of Iowa City. Her father resisted the Vietnam draft, and her parents lived "underground" for several years. In 1978, she moved with her mother to Bellingham, Washington, where she attended Lowell Elementary School, Fairhaven Middle School and Sehome High School. She spent the school year in Bellingham with her mother and the summers in Florida with her father and stepmother and stepbrother.

Cain left Bellingham after high school to study political science at the University of California, Irvine, where she wrote for the New University newspaper and became the opinion editor. After graduating in 1994, she attended the graduate school of journalism at the University of Iowa.

While at Iowa, she wrote a weekly column for The Daily Iowan. Her master's thesis at the University of Iowa became "Dharma Girl," a memoir about Cain's early childhood on the hippie commune. One of her professors presented it to several editors for review, and Seal Press picked it up as Cain's first published work. She was 24 years old.

She traveled across the United States on book tour with "Dharma Girl," living for a brief period in Portland, Oregon, and then in New York City. After a year in New York, she returned to Portland, and edited an anthology for Seal Press titled "Wild Child: Girlhoods in the Counterculture."

After working as a creative director at a public relations firm in Portland for several years, Cain began writing humor books in her spare time, including "The Hippie Handbook: How to Tie-Dye a T-Shirt, Flash a Peace Sign, and Other Essential Skills for the Carefree Life," "Confessions of a Teen Sleuth" and "Does this Cape Make Me Look Fat? Pop-Psychology for Superheroes," which Cain co-wrote with her husband. Cain also composed a weekly column for Portland's alternative newspaper, The Portland Mercury and started contributing to Portland's major daily, The Oregonian in 2003. when she left marketing behind to focus on writing full-time. Her last column with The Oregonian was posted on December 28, 2008.

She wrote her first thriller "Heartsick" in 2004, while pregnant with her daughter. It was published on September 4, 2007, and was an instant New York Times bestseller. "Sweetheart" and "Evil at Heart," the second and third in the series, respectively, are also New York Times bestsellers.

Cain and her family currently reside in Portland, Oregon.