Cardinal George Pell, the Vatican's top finance official, unveiled the new policy at a gathering Sunday of The Global Foundation, an Australia-based organization that seeks to encourage dialogue about global governance, sustainability and other issues.
International Monetary Fund head Christine Lagarde attended the forum and met with Pope Francis today.
Francis has sought to shine the spotlight on the scourge of human trafficking and modern-day slavery and has enlisted Christian and Muslim and other faith leaders to do the same.
Members of the forum include supermarket chain Carrefour and foodmakers Barilla, Campbell's, Nestle, Hershey's and Bumble Bee. It wasn't immediately clear if the forum's internal resolutions are binding on members, though membership can be terminated.
Pell congratulated the Consumer Goods Forum for its pledge and announced the Vatican would do the same.
"It is against this backdrop that I am pleased to confirm that the Vatican itself will commit to slavery-proofing its own supply chains and I hope that today's announcement will serve as encouragement for others to follow suit," he said.