Rachelle Marie Lefevre (born February 1, 1979) is a Canadian actress. She has starred in the television series Big Wolf on Campus and had recurring roles in What About Brian, Boston Legal, and Swingtown. She is also known for playing Victoria in the Twilight saga film series, based on the novels of the same names by Stephenie Meyer. Lefevre stars in the ABC medical drama Off the Map, which premiered in January 2011.Lefevre was born and raised in Montreal, Quebec, Canada, to an English teacher father and a psychologist mother. Her father's family is originally from France and Northern Ireland, and her maternal grandparents are Jewish. She has three sisters and speaks both English and French, though she grew up mostly speaking English. Lefevre attended Centennial Academy, a private high school, and later studied creative arts at Dawson College. She studied theater for two summers at the Walnut Hill School in Natick, Massachusetts, and began a degree in education and literature at McGill University. While working as a waitress at a sushi bar in Westmount, a regular customer, a Canadian television producer, overheard Lefevre telling the hostess that she wanted to be an actress. The producer got Lefevre her first audition, for a role in the sitcom Student Bodies. She didn't yet have a head shot, so submitted a Polaroid picture.

She didn't land the part but got a call back from the casting director, leading to a role in the Canadian TV series Big Wolf on Campus in 1999, playing Stacey Hanson. Lefevre finished her degree at McGill, attending semesters between shoots. Lefevre appeared in the film Confessions of a Dangerous Mind, directed by George Clooney, in 2002. She appeared in the television movies Picking Up and Dropping Off with Scott Wolf, and See Jane Date, and had a role in the romantic comedy Hatley High in 2003. In 2004, she played Etta Place in the Calgary-filmed TV movie The Legend of Butch and Sundance. Lefevre moved to West Hollywood, California that year and appeared in the films Noel, directed by Chazz Palminteri and starring Penélope Cruz, and Head in the Clouds, also starring Cruz and Charlize Theron. In April 2004, Lefevre filmed the mystery-thriller The River King in Halifax, opposite Edward Burns. Lefevre starred on the Fox sitcom Life on a Stick in 2005, playing Lily Ashton, a mall fast-food restaurant employee, and then appeared on the Fox series Pool Guys. She has guest starred on numerous other television series, including: Charmed, playing Olivia Callaway on the episode "Love's a Witch", playing Annie Isles on the fifth season of Undressed, and appearing on the short-lived ABC series What About Brian for eleven episodes. Lefevre was cast as Annie Cartwright, the female lead in ABC's Life on Mars, a David E. Kelley remake of the original British TV series. She shot a pilot episode, but was replaced by Gretchen Mol when the series was revamped.

Lefevre was at times overwhelmed by the scrutiny she received from her involvement with Twilight. She participated in a promotional tour in November 2008, where she met and signed autographs for Twilight fans at Hot Topic stores in the U.S. "It's the closest I will ever come in my life to being a rock star," she told The Canadian Press, describing an appearance on MuchMusic, where over 1,500 fans showed up in Toronto. Over 2,500 fans showed up at a Wal-Mart in Salt Lake City, where Lefevre appeared to promote the DVD release of the film. Overall though, Lefevre described herself as delighted by the attention and excitement of the fans. She appeared in New Moon, the film's sequel, based on Meyer's second novel, which she completed shooting in Vancouver in May 2009. Lefevre did not reprise her role of Victoria in Eclipse, the third film of the Twilight series, and was replaced by Bryce Dallas Howard. Summit Entertainment, the studio behind the films, attributed the change to scheduling conflicts; Eclipse and Barney's Version, an independent Canadian feature Lefevre had signed on to, both began filming on 17 August 2009. Lefevre responded that she was "stunned" by the decision and "greatly saddened" not to continue her portrayal of Victoria, and never thought she would "lose the role over a 10 day overlap", in a statement to Access Hollywood. The studio responded in a counter-statement, "The Twilight Saga: Eclipse is an ensemble production that has to accommodate the schedules of numerous actors while respecting the established creative vision of the filmmaker and most importantly the story." Lefevre had appeared at the 2009 San Diego Comic-Con to promote New Moon the weekend before she was replaced.

In 2009, Lefevre appeared in the CBC television miniseries The Summit, filmed in Ontario, and completed the film Bagman, starring Kevin Spacey. In Bagman, she plays Emily Miller, a former press secretary for U.S. congressman Tom DeLay, who helped convict lobbyist Jack Abramoff (Kevin Spacey) in a political scandal involving Native American tribes. Lefevre will also appear in Barney's Version, a film adaptation of the award-winning Canadian novel by Mordecai Richler. Lefevre plays Clara, a manic depressive feminist poet who becomes the first wife of protagonist Barney Panofsky (Paul Giamatti). Her scenes were filmed in Rome in August 2009. The production continued on location in Montreal and New York. Soon after the shoot, in November 2009, Lefevre shot the suspense film The Caller in Puerto Rico along with actors Lorna Raver and Stephen Moyer. She replaced Brittany Murphy, who had exited the project. Lefevre appeared in the pilot episode of the ABC television drama The Deep End on 21 January 2010. She stars on the television drama Off the Map as Dr. Ryan Clark, a young doctor working in a South American medical clinic. Developed by Grey's Anatomy-creator Shonda Rhimes, the series was filmed in Hawaii and debuted on 12 January 2011. Lefevre will be the voice of the 31st annual Genie Awards in March 2011, along with host William Shatner. She was also cast in the NBC pilot, The Crossing, a drama set during the American Civil War. Lefevre plays Anna, a widow who begins an affair with a soldier.