Cassie Steele

In 2001, Steele first appeared in a Fib Finder commercial alongside Cristine Rotenberg (Simply Nailogical)

In 2001, Steele appeared on an episode of Relic Hunter as the ten-year-old version of Sydney Fox.

Steele has also embarked on a music career. Her debut album, How Much for Happy, was released in 2005, followed by two Canadian tours. Steele's follow-up album, Destructo Doll, was released on July 21, 2009. She appeared on Channel One News to promote the album for the music segment.

Since she was eleven years old, Steele appeared as a regular cast member on Degrassi: The Next Generation playing the character of Manny Santos. She played the role for nine years, before exiting the show in 2010. She has also appeared in three Degrassi TV films: Degrassi Spring Break Movie, Degrassi Goes Hollywood and Degrassi Takes Manhattan.

In 2011, Steele was cast as Abby Vargas in the series The L.A. Complex, which premiered on CTV and Much Music on January 10, 2012, and aired regularly on Much Music. On the same day as the premiere, the series was officially picked up by The CW to begin airing in the United States in the spring. It was renewed for a second season, which aired simultaneously on both Much Music and The CW that summer. The L.A. Complex was officially cancelled on December 20, 2012.

On April 17, 2012, Steele released the extended-play "Shifty" to iTunes. On April 1, 2014, her single "Mad" was released to iTunes. The official lyric video premiered on her VEVO page one day prior.

She starred as Valerie Vont in the Lifetime film Sorority Surrogate, which was released on March 22, 2014. She will appear as Sarah in the film The Dorm later in the year.

On August 12, 2014, Steele released the album "Patterns" to iTunes. The official video for "Games" was released the same year on September 1, and it premiered on her VEVO page. Steele released the single "Power" shortly afterwards. It was released to iTunes on October 21, 2014.

Steele married actor Trent Garrett in November 2018 and was a step-mother to his son Luka, however the couple broke up in the summer of 2020.

In 2019, it was reported that Steele would voice the titular character in the Disney film Raya and the Last Dragon. On August 27, 2020, Steele was replaced by Kelly Marie Tran.