Elizabeth Ann Gilmour (née Smart; born November 3, 1987) is an American child safety activist and commentator for ABC News. She was thrust into the national spotlight at age 14 when she was abducted from her home in Salt Lake City by Brian David Mitchell. Mitchell and his wife, Wanda Barzee, held Smart captive for nine months and repeatedly raped and assaulted her until she was rescued by police officers on a street in Sandy, Utah.

Smart has since gone on to work as an activist and advocate for missing persons and sex abuse victims. Her life and abduction have been the subject of numerous non-fiction books and films.

Elizabeth Ann Smart was born on November 3, 1987, in Salt Lake City, Utah, to Edward and Lois Smart. Her family was part of the Church of Jesus Christ of Latter-day Saints. She is the second-oldest child in her family; she has four brothers and one sister. Smart attended Bryant Middle School and East High School in Salt Lake City. She later enrolled in Brigham Young University, where she studied harp performance.

On June 5, 2002, 14-year-old Smart was abducted at knifepoint from her bedroom in her family's house in Salt Lake City, Utah. For the next nine months, she was raped daily, tied up, and threatened with death if she attempted to escape. She was rescued by police officers on March 12, 2003, on a public street in Sandy, Utah, 18 miles (29 km) from her home. Two witnesses recognized abductors Brian David Mitchell and Wanda Ileen Barzee from an America's Most Wanted episode.^{[citation needed]}

On November 16, 2009, Barzee pled guilty to assisting in the kidnapping of Elizabeth Smart as part of a plea bargain with prosecutors. On May 19, 2010, federal Judge Dale A. Kimball sentenced Barzee to 15 years in federal prison. As part of a plea deal between the defense and federal prosecutors, he gave Barzee credit for seven years that she had already served. The court found Mitchell competent to stand trial for kidnapping and sexual assault charges. He was found guilty on both counts and sentenced in May 2011 to two life terms in federal prison.

Smart's uncle, Tom Smart, and author Lee Benson wrote a book about the search for Smart, In Plain Sight: The Startling Truth Behind the Elizabeth Smart Investigation. Her father wrote another book about Smart's kidnapping, called Bringing Elizabeth Home. A television movie, The Elizabeth Smart Story, was made in 2003, based on the book by Smart's father.

On March 8, 2006, Smart spoke before the United States Congress to support sexual predator legislation and the Amber alert system. On July 26, 2006, she spoke at an event held following the signing of the Adam Walsh Act. Smart was one of five recovered young adults who contributed entries to the 2008 book You're Not Alone, which was published by the U.S. Department of Justice. She appeared at a May 2008 event promoting the book. In 2009, Smart commented on the kidnapping of Jaycee Lee Dugard. She shared that, in her own experience of recovering from trauma, she had found dwelling on the past to be unproductive.

In October 2009, Smart spoke at the 2009 Women's Conference in California (hosted by Maria Shriver) on the topic of overcoming obstacles in life. In 2011, Smart founded the Elizabeth Smart Foundation, which aims to bring hope and end the victimization and exploitation of sexual assault through prevention, recovery, and advocacy. In March 2011, Smart was one of four women awarded the Diane von Furstenberg Award. On July 7, 2011, ABC News announced that she would work as a commentator for them, mainly focusing on missing persons.