1. "Thriller" by Michael Jackson (1982) - Estimated sales: 66 million copies
2. "The Beatles" (White Album) by The Beatles (1968) - Estimated sales: 60 million copies
3. "Pink Floyd: The Wall" by Pink Floyd (1979) - Estimated sales: 45 million copies
4. "Led Zeppelin IV" by Led Zeppelin (1971) - Estimated sales: 37 million copies
5. "Sgt. Pepper's Lonely Hearts Club Band" by The Beatles (1967) - Estimated sales: 32 million copies
Please note that these figures are based on estimates and vary depending on the source. Some albums may have sold more copies in certain regions than others.