Dia Mirza was born in Hyderabad, Andhra Pradesh. Her father, Frank Handrich, was a German graphic and industrial fair designer, architect, artist and interior designer from Munich and her mother, Deepa is a Bengali Indian who is an interior designer, landscaper and currently does social work as a volunteer to help alcoholics and addicts. They separated when she was six years old. Her father died when she was nine and her mother remarried Ahmed Mirza, who died in 2004. She adopted her stepfather's surname Mirza and has recently adopted the last name of her birth-father and became Dia Mirza Handrich.
When living in Khairatabad, Hyderabad district, she attended Vidyaranya High School for Boys And Girls, a school based on the teachings of Jiddu Krishnamurti, and later Nasr School, in Khairtabad. She attended Stanley Junior College and completed her graduation in Bachelors of Arts from Andhra Pradesh Open University, Hyderabad.
Mirza made her cinematic debut with Rehnaa Hai Terre Dil Mein opposite R. Madhavan. Though, the film was not a box office success, but she received a nomination for 'Best Female Debut' at the Zee Cine Awards.When living in Khairatabad, Hyderabad district, she attended Vidyaranya High School for Boys And Girls, a school based on the teachings of Jiddu Krishnamurti, and later Nasr School, in Khairtabad. She attended Stanley Junior College and completed her graduation in Bachelors of Arts from Andhra Pradesh Open University, Hyderabad.
In 2005, Mirza appeared in Parineeta, a Vidhu Vinod Chopra production. She also starred in the music video, Kajara Mohabbat Wala alongside Sonu Nigam from his album Kajara Nite. The album contained multiple remixes, but was mainly advertised with the title song, sung by Sonu Nigam and Alisha Chinai.
She also appeared in the films Dus and Fight Club. She was the only female actor among the six key characters in the film, Acid Factory in which she played a femme fatale who is also a gangster.