He has denounced the world's "idolatry of money" and the "global scandal" that nearly 1 billion people today go hungry, and has charmed the masses with his simple style and wry sense of humor. His appearances draw tens of thousands of people and his (at)Pontifex Twitter account recently topped 10 million followers.
"He really stood out to us as someone who has changed the tone and the perception and the focus of one of the world's largest institutions in an extraordinary way," said Nancy Gibbs, the magazine's managing editor.
The Vatican said the honor wasn't surprising, given the resonance in the general public that Francis has had, but it nevertheless noted the choice was a "positive" recognition of spiritual values in the international media.
"The Holy Father is not looking to become famous or to receive honors," said the Vatican spokesman, the Rev. Federico Lombardi. "But if the choice of Person of Year helps spread the message of the gospel a message of God's love for everyone he will certainly be happy about that."
It was the third time a Catholic pope had been Time's selection. John Paul II was selected in 1994 and John XXIII was chosen in 1962.
In Argentina on Wednesday, Padre Toto, one of the many "slum priests" the pope supported for years as archbishop of Buenos Aires, praised Time's selection.
"The recognition of Time magazine is good news, because Pope Francis embodies one of the values of a church that's more missionary, closer to the people, more austere, more in keeping with the gospel," Toto said. "He had the genius of knowing how to express this sense of the church and hopefully his way of being will catch on with other political leaders, business executives, sports figures. His leadership is inspiring."
Besides Snowden, Time had narrowed its finalists down to gay rights activist Edith Windsor, U.S. Sen. Ted Cruz of Texas and Syrian President Bashar Assad.
President Barack Obama was Time's selection for 2012.
Time editors make the selection. The magazine polled readers for their choice, and the winner was Egyptian General Abdel-Fattah el-Sissi, who didn't even make the top 10 of Time's final list.