The observational documentary series about patients and staff at South London and Maudsley NHS Foundation Trust (SLaM) made with Channel 4 and Garden Productions won the award at a ceremony held at Grosvenor House, London on February 4.
Bedlam was broadcast in October and November 2013, and fought off stiff competition from five other popular series, including Benefits Street, Life and Death Row and Long Lost Family to win the award.
The series was the result of a 2-year project and the four 60-minute programmes focused on a range of mental health issues including anxiety, crisis, depression and schizophrenia.
Find out more about 'Bedlam' in our feature: Life through a lens
In May 2014 the series won a BAFTA television award for ‘best factual series’. It's latest award came at a ceremony hosted by David Walliams and showcases the best in British television, with more than 100 programmes across 20 categories in the final shortlists.
Speaking about the series when it was first commissioned SLaM chief executive Matthew Patrick said: "This is a great opportunity to promote public awareness and understanding of mental health.
"The films are powerful, bold and honest. We are very proud to be taking part in something so ground-breaking and I hope it goes some way to making a difference to the lives of vulnerable people."