The finale episode of the series was watched by an audience of 17.1 million people, 28-day 4-screen consolidated figures have revealed.
The BBC says that this makes it the UK’s most watched episode of any drama series across all channels since current records began, in 2002.
Plus, it's the largest TV audience outside of sporting and national events since 2010.
On iPlayer, Bodyguard has received over 38 million requests.
Charlotte Moore, Director BBC Content, said: "Bodyguard continues to smash records and thrill new audiences everyday via the boxset, which is available exclusively on BBC iPlayer for the next five months."
Simon Heath, CEO & Creative Director of World Productions, added: “A big thank you to the BBC for their terrific support and to everyone who watched Bodyguard either live or on catch up. We’re hugely grateful”.
The numbers were measured using BARB’s new 4-screen 28-day measure, which was introduced in August 2018. This includes viewing not only through TVs but also online non-TV devices.
Excluding four-screen viewing, the figure for Bodyguard's finale (15.9 million) still remains the highest number for an episode of a drama series since current records began in 2002.