Giorgio Calcaterra (born 11 February 1972 in Rome) is an Italian ultramarathoner, three times world champion of the 100 km.

He is the most successful athlete at the IAU 100 km European Championships, being a three-time winner and also a silver and bronze medallist from 2008 to 2015.

He is a three-time Italy winner of the Wings for Life World Run.

[3] Calcaterra has been a vegetarian since the age of 15 and in 2019 became a vegan for ethical reasons.

[4] Also Connemara International Ultra Marathon course record holder 63 km 3:56