The call comes after activist investor Palliser Capital made a shareholder resolution to keep only the group's ASX spot, amid claims the dual listing had eroded $US50 billion ($A78.5 billion) in company value.
Rio's board strongly denied the claims.
"A unification of the DLC (dual-listed companies) would be value destructive for the group and its shareholders," the board wrote.
"Assertions about $US50 billion of value erosion due to the group's DLC are both unfounded and misleading."
Palliser, a UK hedge fund with a $300 million or 0.7 per cent stake in Rio, called for a review of the structure at a shareholder meeting in December.
More than 100 other shareholders have backed the plan to consolidate the listings.
Fellow metals giant BHP ended a similar configuration in 2022 and reverted to its Australian listing, but Rio's board shirked any comparison because of differences in the location, growth outlook and tax profile of the group's assets.
Earlierin March, proxy adviser Glass Lewis threw its weight behind the proposal, which was welcomed by Palliser's founder and chief investment officer James Smith.
"We appreciate the support of Glass Lewis and its confirmation that the Rio Tinto board needs to do better by its shareholders and deliver a more robust investigation of their archaic structure - given the tens of billions of dollars of value at stake for them," Mr Smith said.
Rio Tinto's UK annual general meeting is slated for April 3 in London, before the Australian meeting on May 1 in Perth.
RIO shares were trading slightly lower, down 0.2 per cent for the day to $119.21.
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