Ioannis Georgios Lavrentis () was a Greek athlete who was likely the second runner to win a marathon. On March 12, 1896, he was first in a field of 38 runners attempting to qualify for the 1896 Summer Olympics in Athens, Greece (3:11:27).

One month later, he was one of 17 athletes to compete in the first Olympic marathon. Seven runners, including Lavrentis, did not finish the race.

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Year of birth missing
Year of death missing
Greek male long-distance runners
Greek male marathon runners
Olympic athletes for Greece
Athletes (track and field) at the 1896 Summer Olympics
19th-century sportsmen
Place of birth missing
Place of death missing