The ExploreChurches site aims to make it easy to discover beautiful and fascinating churches across Britain.
The website brings churches to life by using high quality images and providing information about the history and architecture of individual buildings. More than 1,300 churches are already listed on the site.
Bryson, author of Notes from a Small Island, said: "It is impossible to overstate the importance of churches to this country.
Among his top picks of historical churches are St Martin's in the Field in London, Durham Cathedral and Hexam Abbey.
BILL BRYSON'S FAVOURITE CHURCHES
Christchurch Priory, Christchurch, Dorset
St Martin in the Fields, Trafalgar Square, London
St Michael, Cornhill, London
St Andrew, Alfriston, East Sussex
St Pancras, Widecombe in the Moor, Devon
St Mary the Virgin, Iffley, Oxfordshire
St Andrew, Whissendine, Rutland
All Saints, Bakewell, Derbyshire
St Michael the Archangel, Kirkby in Malhamdale, Yorkshire
Durham Cathedral, Durham
Hexham Abbey, Hexham, Northumbria
Cartmel Priory, Cartmel, Cumbria
The Italian Chapel, Lambholm, Orkney, Scotland
Claire Walker, Chief Executive of the National Churches Trust, said: "'ExploreChurches' makes it easy for people to discover the UK's beautiful and fascinating churches."
"As the national charity dedicated to promoting and supporting church buildings of historic, architectural and community value across the UK, our vision is that 'ExploreChurches' will become the leading source of information about churches for visitors, including both tourists and local people."
Bryson, renowned for his love of the British countryside, was appointed a Vice-President of the National Churches Trust in January.