Kyle Rittenhouse intends to sue LeBron James ... after he says the NBA superstar defamed him during his murder trial late last year to his 50+ million fans on social media.
And, he's not just going after The King ... he also says he's going after President Joe Biden and Whoopi Goldberg, among others.
As you know, 19-year-old Rittenhouse was charged with 2 counts of homicide, 1 count of attempted homicide, in addition to other charges, for shooting 3 people -- 2 fatally -- at a protest in Kenosha, WI.