The Only Man Naruto Ever Killed

Naruto has only killed one person in the entire Naruto series. It was in Naruto Shippuden, during the Kazekage Rescue Arc. He killed Yuura, the Sand Village Jonin Nagato used to make an Itachi body double and fight against team 7. There was the Itachi vs Kakashi and Itachi vs Naruto fight there, where Naruto nailed Itachi with his Giant Rasengan, killing Yuura in the process.
Naruto doesn't kill anyone else in the series.