Mitchell was born to Sharon Mitchell (née Weisz), an office manager, and David Mitchell, an auto racing promoter. Her parents have since divorced and remarried and she has a half-brother Giuseppe Tomasino from her father's second marriage. She shares one thing in common with her former “7th Heaven” co-star Catherine Hicks: both are former cheerleaders in high school.

After graduating from Chaminade College Preparatory School in 1999, she enrolled at Loyola Marymount University where she majored in film.

Mitchell's first major film role was in “The Crow: City of Angels.” During the filming of “The Crow,” in 1996, she auditioned for the role of Mary Camden in a new family drama, “7th Heaven.” Producers initially turned her down as they did not think she was suitable to play Mary. However, when she read for the part for the sister, Lucy, she was instantly cast. “7th Heaven” was a huge success, lasting for 11 seasons, beating both the “The Waltons” and “Little House on the Prairie” for the record as the longest-running family drama in television history, while also becoming the highest-rated show on The WB Network.

Beverley is very close to her former “7th Heaven” cast mates, calling them her "second family," and is best friends with onscreen sister Jessica Biel. She is also good friends with singer Lance Bass and singer/actress, Haylie Duff.

In 2000, she had a small part in “The Amanda Show” as a customer in Moody's point. In 2003, Beverley played Erica Enders on Disney Channel Original Movie “Right on Track.” It was based on a true story about two sisters who drove race cars. And in 2005, during a hiatus from filming “7th Heaven,” Mitchell played in the horror sequel “Saw II.” She was skeptical about taking on the role at first as she has admitted she is not a fan of horror movies.

On New Year's Eve 2005, during a trip to Colorado, Beverley became engaged to her long-time boyfriend, accountant Michael Cameron. They had originally planned to get married in 2007, but decided to put the wedding on hold due to the release of Beverley's debut album. The wedding took place on October 1, 2008 in Ravello, Italy on the Amalfi Coast. Former “7th Heaven” cast mates Jessica Biel and Mackenzie Rosman attended, with both as bridesmaids.

Her life-long dream of becoming a country music singer came true when, in 2006, she recorded her debut album, Beverley Mitchell with record producer D. Scott Miller in Nashville, TN. She co-wrote 8 of the songs featured on the album, including the hit single "Angel", which was written in memory of her late friend Angela.

In the summer of 2007, Beverley starred in the TV movie “I Know What I Saw,” which aired on the Lifetime Television network. Beverley also has plans of recording a second album, and hopes to record her own version of the song "When You Say Nothing At All" on the album.

In 2010, it was announced that Mitchell would join the cast of “The Secret Life of the American Teenager” as a school counselor, which began in January 2011.