The ITV crime story, set in a Dorset coastal town and starring David Tennant and Olivia Colman, was among a host of dramas that dominated the Top 10.
The Radio Times list was compiled by the magazine's critics and saw French supernatural thriller The Returned second, followed by fellow Channel 4 show, the fly-on-the-wall documentary Educating Yorkshire.
Top Of The Lake, the Jane Campion drama starring Elisabeth Moss, was fourth, with James Corden's new comedy The Wrong Mans and American show Homeland in fifth and sixth place.
Tim Glanfield, editor of RadioTimes.com, said: "The death of event TV has been greatly exaggerated.
"Broadchurch drew the nation into a collective hysteria every Monday night for eight weeks, as who killed Danny Latimer became the talking point in the press, pubs, front rooms and factories up and down the country.
"A brilliant piece of homegrown drama with an exquisite cast of actors, Broadchurch is a fantastic example of British TV at its very best."