The track was number one in more than 30 countries worldwide, including the US, Germany, France, Italy, Australia and the UK.
Adele's album 25 followed in November and has notched up worldwide sales of over 15 million.
Other acts in the top 10 include Ed Sheeran, One Direction, Coldplay and Sam Smith.
Sheeran took second place, one up from the third spot he occupied on the 2014 ranking.
He also kept a high profile in 2015 due to a busy schedule of touring, award wins and personal appearances, while launching his own record label, Gingerbread Man Records, an imprint of Atlantic Records UK.
In third place was Taylor Swift, who was the recipient of the 2014 IFPI Global Recording Artist award.
IFPI's Global Recording Artist award and top 10 chart is the only ranking to accurately capture the popularity of artists across streaming channels, alongside digital and physical album and singles sales on a global basis.
Top 10 Global Recording Artists of 2015
1. Adele
2. Ed Sheeran
3. Taylor Swift
4. Justin Bieber
5. One Direction
6. Coldplay
7. Maroon 5
8. Sam Smith
9. Drake
10. The Weeknd
- AAP