Surprisingly, Clint Barton now holds the record for the highest kill count in a single MCU project thanks to Marvel's Hawkeye on Disney+.
In total, Hawkeye's on-screen kill count comes out to between 50 and 55 bodies total, a number that ignores arrows fired only at hands or feet as well as any trick arrows that looked to be non-lethal.
In comparison, Tony Stark has one of the higher kill counts thanks to the first Iron Man when he escaped the Ten Rings (around 35).
The Winter Soldier's kill count is closer at around 45 on-screen kills, that's only when looking at all of his MCU appearances in total and he isn't a hero for a lot of that time, of course.
It's shouldn't be that much of a surprise that Hawkeye's kill count is so high. Clint Barton isn't shy in the series about being a killer. It's what he was trained to do long before Hawkeye became an Avenger, being pointed and fired at targets who need to be eliminated.
All episodes of Hawkeye are streaming now on Disney+.