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The move, effective July 10, clears the way for millions of British tourists to take summer holidays without worrying about being quarantined when they return. Those arriving from higher-risk countries will still have to self-quarantine for 14 days under a rule which has angered airlines and travel companies.
Prime Minister Boris Johnson's government had debated for days how to ease the quarantine rules. Scotland, Wales and Northern Ireland, which set their own health policies within the United Kingdom, have not announced plans to lift the measures.
"There will be a list of 50 plus countries and if you add in the overseas territories, 60 something or other that we will publish later today," Transport Secretary Grant Shapps said.
"Today marks the next step in carefully reopening our great nation," he said.
As the spread of the novel coronavirus slows in Europe, countries are reopening travel after more than three months of lockdown.
The full list of countries has not yet been published. New Zealand is included, as are the Vatican and Britain's overseas territories such as the Falkland Islands and Gibraltar. The United States remains on the "red list".
"The U.S. from a very early stage banned flights from the UK and from Europe so there isn't a reciprocal arrangement in place," Shapps said.
Britain's foreign ministry will also set out exemptions from a global advisory against "all but essential" international travel, from July 4, a key to normal insurance being valid.
The government said it expected countries included on the quarantine-free list to reciprocate by relaxing their own restrictions.
The move to ditch the quarantine comes as England's High Court is due to hear a legal challenge by British Airways , backed by low-cost rivals Ryanair and easyJet . They argue the quarantine had no scientific basis and was unworkable.
Britain, with the highest COVID-19 death toll in Europe, is slowly reopening its economy. England and Northern Ireland will reopen pubs this weekend, and Scotland and Wales are expected to follow later in July.
Johnson has warned people to maintain social distancing rules and is expected to repeat that caution at a news conference on Friday.
"Anyone who flouts social distancing and COVID-secure rules is not only putting us all at risk but letting down those businesses and workers who have done so much to prepare for this new normal," he will say.