Ventura County Superior Court Judge Roger Lund ended the conservatorship during a hearing in an Oxnard courtroom, her attorney David A. Esquibias stated.
Lund stated that "the court determines that conservatorship is not required" in court documents that outlined the case before he made his decision.
Bynes, now 35 years old, rose to fame as a teenager on two Nickelodeon shows. However, her struggles with substance abuse, mental health and the law led to her parents establishing a conservatorship in 2013 to give them court control.
Lund stated this week that Bynes had shown competency in managing her own affairs, including her mental and medical health.
Bynes' conservatorship ended, but far more quietly and peacefully than that of Britney Sparrow who had a long and bitter struggle to end a similar arrangement.
Bynes' parents agreed that the conservatorship should be ended and no one objected. Lynn Bynes, her mother, was the conservator for Bynes' daughter since its inception nearly nine years ago.
Her parents stated to the court that they were concerned that their daughter, now 27, could have caused harm to herself and others if they did not allow them to take control of her finances and medical care.
They claimed Bynes was engaging in disturbing behavior and that she was being monitored through smoke detectors and on her car's dashboard. Her parents were concerned that she planned to perform dangerous and unnecessary cosmetic surgery.
Bynes was also arrested in New York, for throwing a pot bong from her Manhattan apartment on the 36th floor, and in Los Angeles, for driving under the influences, driving with a suspended license, and misdemeanor hit and run. According to her parents, she also set fire to the driveway of Thousand Oaks home where she grew-up.
Bynes was just 13 years old when she landed her first hit Nickelodeon variety show, "The Amanda Show." She also appeared on the Nickelodeon sketch series, "All That." She then went on to star on the TV series "What You Like About You" as well as in movies like "What a Girl Wants", "Hairspray" or "She's the Man."
Since the Emma Stone film "Easy A", in 2010, she has been absent from acting and has stated publicly that she has retired from acting.
Interviews with Bynes revealed that she had been sober for many years and is currently studying at the Fashion Institute of Design and Merchandising Los Angeles.