Socially distanced indoor live performances will be able to resume from August 15
Theatres across the UK have been shut since March as part of restrictions amid the ongoing pandemic.
Socially distanced outdoor performances were previously given the green light to begin July 11.
Indoor performances have now been given the green light to begin from Saturday, August 15 so long as social distancing guidelines are followed.
However the Prime Minister warned: "We will not hesitate to put on the brakes if required, or to continue to implement local measures to help to control the spread of the virus."
Culture Secretary Oliver Dowden commented: "The UK's performing arts sector is renowned across the world and I am pleased that we are making real progress in getting its doors reopened to the public with social distancing. From August indoor theatres, music venues and performance spaces will safely welcome audiences back across the country.
"This is a welcome step in the path to a return to normal and, coupled with our £1.57 billion rescue package, will help secure the future of this important sector."
The government previously said it did not expect non-socially distanced events to be permitted before November at the earliest.
Chancellor Rishi Sunak is to offer a lifeline to theatres, music venues and museums amid the ongoing global health crisis which includes £880 million worth of grants, as well as £270 million of repayable loans.