1. Mandarin Chinese: 939 million
2. Hindi: 602 million
3. English: 379 million
4. Spanish: 534 million
5. Arabic: 274 million
6. Bengali: 265 million
7. Portuguese: 258 million
8. Russian: 154 million
9. Japanese: 128 million
10. Punjabi: 100 million
Note: These numbers can vary slightly depending on the source and the methodology used for counting speakers.