Thomas Xenakis was a Greek gymnast. He competed at the 1896 Summer Olympics in Athens.

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's time is unknown, though it was slower than 23.4 seconds, which was Andriakopoulos's winning time.

Silver medal	Gymnastics Rope climbing