Thomas Xenakis, Greek-American gymnast (d. 1942)
Thomas Xenakis (Greek: Θωμάς Ξενάκης; March 30, 1875 – July 7, 1942) was a Greek gymnast. He competed at the 1896 Summer Olympics in Athens. He was born in Greece and died in Orange, California, United States.Xenakis competed in the rope climbing event. He and countryman Nikolaos Andriakopoulos were the only two out of the five entrants to climb all the way to the top of the 14 metre rope. Xenakis' time is unknown, though it was slower than 23.4 seconds, which was Andriakopoulos's winning time.

He won his second silver medal as a member of the Greek gymnastics team in the parallel bars event.