Last year, Rashford led a campaign to end child food poverty and successfully lobbied the British government to continue providing free school meals during the holidays.
The 23-year-old was awarded an MBE for services to vulnerable children during the COVID-19 pandemic.
"A lot of the young people I meet, including Marcus, they're ahead of where I was when I was 23," Obama said in a Zoom call organized by publishers Penguin.
"They're already making changes and being positive forces in their communities."
The Manchester United forward said it was "surreal" talking to the former U.S. President.