"Mezmerize" is the fourth album of the band around Serj Tankian. It was originally released on May 17, 2005 as the first part of the double album "Mezmerize / Hypnotize". The second part followed in November of the same year.

The album features a total of eleven songs, including the singles "B. Y.O. B." and "Question!".

"Mezmerize" reached number one in the charts in several countries, including the USA, Great Britain and Germany. It remains the band's most successful album to date.