The Independent Press Standards Organisation is set to launch on 8 September.
According to the Newspaper Society, IPSO chairman Sir Alan Moses has written to publishers to confirm the launch date.
IPSO, which is set to replace the Press Complaints Commission, says that more than 90 per cent of the UK's national press and the majority of regional press and major magazine publishers have elected to be subject to its regulation.
The publishers of The Guardian, Independent titles and Evening Standard and the Financial Times have not signed up for IPSO. The FT announced in April that it would be setting up its own regulation system.
Referring to Moses's letter to publishers, the Newspaper Society said: "From that date [8 September], complainants to IPSO who raise substantive concerns under the Editors’ Code will be referred directly to publications to resolve their complaints, so he stressed the need for publishers to have effective complaints-handling systems in place.
"He said IPSO would provide a form of open and accessible regulation for the benefit of the public and the press. As an independent regulator, IPSO was committed to maintaining a free and independent press and building public trust in its work."