The Turkish farmer - who at 8ft three ins, dwarfs his 5ft 8 ins fiancee - is set to marry Merve Dibo in a ceremony today.
Kosen has long been searching for a woman to share his life with, and had reportedly given up hope - until he met Ms Dibo.
He told an AA reporter: 'Now I will have my own family and private life.
'How unfortunate I could not find a suitable girl of my own size. My fiancee is over 1.75 meters tall, but I believe I've found the person for me.'
Kosen also holds the Guinness World Record for the size of his 27.5cm hands and feet, which are recorded 36.5 centimetres - a massive size 28.
His gigantic wedding suit and shoes will be custom made, and the giant, who has achieved near celebrity status, has invited a host of politicians to his nuptials in the southern Turkish city of Mardin.dfafa
Kosen said all he wants now is a car big enough for his size in which he can travel with his bride.
He is one of only ten people ever to top 8 feet and the first in a decade.
He became the world’s tallest man in August 2009, when he shot past China’s Bao Xishun at 7ft 9ins.
Sultan suffers from a rare disorder called pituitary gigantism, which causes his body to continually produce the growth hormone.
His condition is believed to have been caused by a tumour in the pituitary gland.
Doctors thought they had cured him in 2008 when they removed the tumour but he continued to grow by half and inch a year.
Now medics say he has finally stopped growing.
Sultan grew normally until he was ten but the tumour then caused him to develop the medical condition.