Sasha Fierce was the alter ego Beyoncé used for the second disc of her 2008 album I Am... Sasha Fierce.
The double album contrasted two sides of her public and artistic identity. The first disc, I Am..., focused on more personal and emotionally direct songs, while the second, Sasha Fierce, emphasized a bolder performance persona.
Beyoncé described Sasha Fierce as an onstage alter ego that helped her separate performance confidence from her private self. The album included major singles such as “If I Were a Boy,” “Halo,” “Single Ladies (Put a Ring on It),” and “Diva.”
The title is often shortened in conversation, but the complete album title is I Am... Sasha Fierce. The persona was later retired publicly, making the term especially tied to the 2008 album era.