1. Mandarin Chinese: With over 1 billion speakers, Mandarin is spoken primarily in China, but also in other parts of East and Southeast Asia.
2. Hindi: Spoken by around 600 million people, Hindi is the official language of India and is also spoken in other parts of South Asia.
3. English: With around 1.5 billion speakers, English is spoken by people all over the world and is the official language of many countries.
It's important to note that these numbers can vary depending on the source and how "speaker" is defined (e.g., native speakers, second language speakers, etc.).