"Clare's Law", which enables women to check the police record of a new boyfriend, will be expanded to cover all of England and Wales.
It has been piloted in Greater Manchester, Wiltshire, Nottinghamshire and Gwent since September 2012.
The policy is named after Clare Wood, who was murdered by her ex-boyfriend George Appleton at her Salford home in February 2009.
Home Secretary Theresa May, who will give a statement in the House of Commons later, told the Sun there had been "considerable confusion" up until now about what police could tell women about a man's violent past.
"Clare's Law provides people with the information they need to escape an abusive situation before it ends in tragedy," she said.
"The national scheme will ensure that more people can make informed decisions about their relationship and escape if necessary.
"This is an important step towards ensuring we do better by women like Clare Wood in the future."