The men's 400 metres hurdles was a track & field athletics event at the 1900 Summer Olympics in Paris.

Henri Tauzin of France earned silver, while George Orton of Canada, who was representing the United States, took bronze.

[5] Bohemia, Canada, France, the United States competed in the inaugural 400 metres hurdles event.

Tewksbury beat Lewis by ten yards; Nedvěd, who was well back in third, was the only athlete eliminated in the semifinals.

For the three starters, this was the only race that posed any sort of challenge, with hurdles fashioned out of 30-foot long telegraph poles and a 16-foot water jump on the final straight.