BT Sport will show Aviva Premiership Rugby until at least the end of the 2020-21 season. The four-year extension to the current contract makes it the longest ever TV deal for Premiership Rugby.
BT Sport will also show more live games. It will broadcast up to 80 live matches per season, up from the current limit of 69. This will start with the 2017-18 season.
Starting this season, BT Sport will have the rights to show extended highlights for all 135 Aviva Premiership Rugby matches, and live broadcast rights to matches from the Singha Premiership Rugby 7s Series until the end of the 2020-21 season.
The Premier League and BT Sport will also develop a community rugby programme, and will continue to promote English club rugby.
"BT Sport has been a fantastic partner for English club rugby so we are delighted that we have been able to extend our relationship with them for a further four years," said Mark McCafferty, the chief executive of Premiership Rugby. "This is the longest TV agreement in the history of Premiership Rugby.
"In the 18 months we have been on-air with them our live TV audiences have grown by 50 per cent so it is clear that the partnership is going from strength to strength."
John Petter, chief executive of BT Consumer, added: "We are absolutely delighted to be extending our partnership with Premiership Rugby. 2015 will be an amazing year for rugby in the UK and the popularity of rugby will continue to grow. We're delighted to be part of this and that our customers can look forward to another six seasons of the Aviva Premiership on BT Sport."