The Juventus superstar boasts the most followers of any sportsman on the platform, with 239 million.
HopperHQ have reported Ronaldo's fee of $889,000 (£750,000) per post puts him clear of second placed Neymar, who earns $704,000.
Longtime rival Lionel Messi places in third while David Beckham and NBA star LeBron James make up the top five.
Interestingly, Tottenham Hotspur winger Gareth Bale manages to make the top ten despite his lack of game time in recent years.
Bale rejoined Spurs from Real Madrid on loan in the summer after being frozen out by manager Zinedine Zidane, but it's clear to see he's still a big name in the sporting world.
Check out the full list of athletes below.
1. Cristiano Ronaldo (Football) - $889,000 per post
2. Neymar (Football) - $704,000 per post
3. Lionel Messi (Football) - $695,000 per post
4. David Beckham (Football) - $339,000 per post
5. LeBron James (Basketball) - $307,000 per post
6. Virat Kohli (Cricket) - $296,000 per post
7. Ronaldinho (Football) - $238,000 per post
8. Gareth Bale (Football) - $200,000 per post
9. Zlatan Ibrahimovic (Football) - $200,000 per post
10. Mohamed Salah (Football) - $180,000 per post
11. Luis Suarez (Football) - $176,000 per post
12. Conor McGregor (MMA) - $170,000 per post
13. Stephen Curry (Basketball) - $142,000 per post
14. Floyd Mayweather (Boxing) - $108,800 per post
15. Sergio Aguero (Football) - $63,500 per post
16. Ronda Rousey (MMA) - $60,300 per post
17. Serena Williams (Tennis) - $57,300 per post
18. Kevin De Bruyne (Football) - $51,600 per post
19. Simone Biles (Gymnastics) - $17,800 per post
20. Kelly Slater (Surfing) - $12,5000 per post
21. Ryan Sheckler (Skateboarding) - $10,200 per post
22. Max Holloway (MMA) - $9,700 per post
23. Lindsey Vonn (Skiing) - $9,300 per post
24. Shaun White (Snowboarding) - $6,600 per post
Featured Image Credit: Instagram
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