Mr Blatter’s rival, Prince Ali bin al-Hussein of Jordan, had forced a second round of voting but withdrew.
In his victory speech, Mr Blatter said: “I’m not perfect. Nobody is perfect. But we will do a good job together.”
Seven top officials were arrested in Switzerland on Wednesday as part of a US prosecution that indicted 14 people.
Mr Blatter, 79, has faced calls to resign, including from UK Prime Minister David Cameron, who said in Berlin on Thursday that the Fifa president should quit “the sooner the better” bbc.