I Am... Sasha Fierce is the third studio album by American recording artist Beyoncé. It was released on November 15, 2008, by Music World Entertainment and Columbia Records. In its initial release, the album was formatted as a dual disc, intending to market Beyoncé's contrasting facets of artistry. The first disc, I Am..., contains slow and midtempo pop and R&B ballads, while the second, Sasha Fierce (named after Beyoncé's on-stage alter ego), focuses on more uptempo beats that blend electropop and Europop genres. In composing the songs' lyrics, Beyoncé worked with many writers, with each session accompanied by live orchestration.

Beyoncé credited both her husband, rapper Jay-Z, and jazz singer Etta James for inspiring her to push the limits of her songwriting and artistry. Musically, I Am... drew inspiration from folk and alternative rock, while blending acoustic guitar elements into contemporary ballads. The tracks on the first disc were written and produced by Beyoncé, during collaborative efforts with Kenneth "Babyface" Edmonds, Christopher "Tricky" Stewart, Terius "The-Dream" Nash and Ryan Tedder. Sasha Fierce boasted production from Rodney "Darkchild" Jerkins and Sean "The Pen" Garrett. The album received generally lukewarm reviews from critics, many of whom felt that it does not properly differentiate the double-discs' contrasts and goals.

I Am... Sasha Fierce debuted at number one on the Billboard 200 chart, with first-week sales of 482,000 units, earning Beyoncé her third consecutive US number-one solo album. The album earned over thirty platinum and one diamond certifications in separate worldwide markets. I Am... Sasha Fierce had sold 7.9 million copies worldwide with 35.65 million songs sold. The album garnered seven Grammy Award nominations at the 52nd Annual Grammy Awards ceremony, winning five and eventually collecting a record setting six wins—the most awards won in one night by a female. To promote the album, Beyoncé made several award show and televised appearances across Europe and America and embarking on the worldwide I Am... World Tour (2009–10).

The album spawned several singles; some served as international and stateside releases, while others were purely for promotional purposes. The two lead singles from I Am... Sasha Fierce, "If I Were a Boy" and "Single Ladies (Put a Ring on It)", both charted highly internationally. The former topped the charts in over eight countries and reached number three on the Billboard Hot 100, with the latter becoming her fifth number one single on the Hot 100 chart. "Diva" and "Ego" were released as US-only singles, while "Halo" and "Sweet Dreams" were promoted internationally as the third and fourth singles respectively. "Broken-Hearted Girl" was released internationally as the fifth single, while "Video Phone" was released in November 2009 and "Why Don't You Love Me" was released in July 2010.