Delegates representing each of Fifa's 208 member nations unanimously backed Blatter, who originally succeeded Joao Havelange in 1998. His new term of office will last four years, expiring at the 61st congress in 2011.
"It is with great joy when I hear that I have the confidence of the 57th Congress giving me the mandate as FIFA president from 2007 to 2011," said Blatter. "Thank you for your trust and putting me once again at the helm of this institution."
Blatter restated his support for South Africa 2010, making it absolutely clear that there was no chance of South Africa being replaced by a reserve host nation.
"There is no problem whatsoever," he insisted. "There is a plan B, C and D and all of them are South Africa."
In his pre-vote address to delegates, Blatter pledged over the next four years to continue the fight against "the devils and evils that beset football", notably doping, corruption, cheating, racism and the growing number of civil court cases being taken out against Fifa.
"We are at a crossroads in football," he said. "We must be tough in the application of our rules."
He also reiterated his refusal to introduce video technology during his presidency despite growing clamour for increased electronic aids for officials. "We must safeguard the human face of our game," he added.
