Conor McGregor Jumps LeBron James On Forbes List

Conor McGregor's gonna LOVE this -- Forbes just named him the 4th highest-paid athlete over the last 12 months ... over guys like LeBron James, Neymar and Roger Federer.

So, how much cash has Conor raked in? Forbes is estimating he's made $99 mil -- most of the cash was from his fight with Floyd Mayweather. Conor was ranked #24 the previous year with $34 mil in earnings.

Speaking of Floyd ... he's #1 -- with an estimated $285 MIL!!! (He was ranked #16 the previous year with only $44 mil).

He's followed by a pair of soccer superstars ... Lionel Messi ($111 mil) and Cristiano Ronaldo ($108 mil).

Remember, Conor once told Ronaldo to his face that he was coming for him on the Forbes list ... to which Ronaldo responded, "I don't think so."

He still might get him one day ... but it's not today.

Others on the list include ... Steph Curry ($76.9), Matt Ryan ($67.3), Matthew Stafford ($59.5) and Kevin Durant ($57.3).