The charity says it hopes the move will curb incidents of anti-social behaviour at four trial sites.
Cameras will be clearly visible but turned on only when necessary, with people warned they are going to be filmed, the charity says.
It said in a statement: “The vast majority of people come to our sites to enjoy a great day out, but sadly we do see isolated incidences of anti-social behaviour directed towards our staff.
“It’s really important that our team feel safe and supported. Staff will only activate the cameras if the situation requires it.”
Police officers routinely wear bodycams but they are increasingly being used to protect staff — including at supermarket chains such as Lidl and Tesco as well as NHS trusts.
Dartmoor National Park Authority has also confirmed rangers would continue using body-worn cameras while out on patrol after a successful two-year trial.
The pilot was used to address abuse by some visitors at the moorland in Devon.
English Heritage cares for more than 400 historic buildings and monuments — including tourist sites such as Stonehenge in Wiltshire and Hadrian’s Wall in Cumbria.
The body cameras will be trailled at Kenwood House in North West London, Marble Hill in South West London, Tilbury Fort in Essex and Wrest Park, Bedfordshire.
A report last week by Government body Historic England found theft and vandalism were on the rise at heritage sites.
Artwork, antiques and historic stone were among items worth more than £3.2million stolen in 2021 to 2022.