Yousafzai posted a picture of the two young activists on Instagram, saying simply: "Thank you @gretathunberg".
"She's the only friend I'd skip school for," she said on Twitter.
She’s the only friend I’d skip school for. pic.twitter.com/uP0vwF2U3K
— Malala (@Malala) February 25, 2020
Also posting on social media, Thunberg said: "So...today I met my role model. What else can I say?"
So... today I met my role model. What else can I say? @Malala pic.twitter.com/n7GnXUngov
— Greta Thunberg (@GretaThunberg) February 25, 2020
It is not known what the pair discussed, the report said.
According to Alan Rusbridger, the principal of Lady Margaret Hall, Thunberg spoke to students about "science, voting, the limits of protest, divestment, real zero v net zero, and much more" during her visit.
Commenting on the meeting between Thunberg and Yousafzai, Jennifer Cassidy, a lecturer in politics at the University of Oxford, wrote: "I walk out my door, up one street and see @Malala and @GretaThunberg talking outside.
"Two powerful young women standing for justice, truth and equality for all," Cassidy tweeted.
Good Morning Britain host Piers Morgan said: "What a photo... the two most influential young women of my lifetime meet in Oxford."
But some others
were less complimentary, describing the pair as "overrated", the BBC report said.
Twitter user Luis Hulyer said: "One risked her life to go to school, the other plays truant."
Two years ago, Thunberg started missing lessons most Fridays to protest outside the Swedish Parliament building, in what turned out to be the beginning of a huge environmental movement.
She has become a leading voice for action on climate change, inspiring millions of students to join protests around the world.
Thunberg has been named Time magazine's Person of the Year for 2019.
In 2012, Yousafzai was shot in the head, neck and shoulder by a Taliban militant while returning home from school. She angered the Taliban by writing an anonymous diary about life under the extremists in the picturesque Swat Valley in Pakistan.
After recovering from her near-fatal injuries, she and her family relocated to Birmingham.
In 2014, Yousafzai became the youngest person ever to win the Nobel Peace Prize, at the age of 17. Three years later she accepted a place to study at Oxford.
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