American singer Britney Spears has developed and endorsed a number of products; these have included books, video releases, video games, dolls, clothing, and perfumes. In 2000, Spears released a limited edition of sunglasses titled Shades of Britney.^[1] In 2001, she signed a deal with shoe company Skechers,^[2] and a $7–8 million promotional deal with Pepsi, their biggest entertainment deal at the time.^[3] Aside from numerous commercials with the latter during that year, she also appeared in a 2004 Pepsi television commercial in the theme of "Gladiators" with singers Beyoncé, Pink, and Enrique Iglesias.^[4] On June 19, 2002, she released her first multi-platform video game, Britney's Dance Beat, which received positive reviews.^[5] In March 2009, Spears was announced as the new face of clothing brand Candie's.^[6] Dari Marder, chief marketing officer for the brand, explained why they choose the singer, saying, "everybody loves a comeback and nobody's doing it better than Britney. She's just poised for even greater success."^[6] In 2010, Spears designed a limited edition line for the brand, which was released in stores in July. In 2011, she teamed up with Sony, Make Up For Ever, and Plenty of Fish to release her music video for "Hold It Against Me", earning her $500,000 for the product placement.^[7] Spears also teamed up with Hasbro in 2012 to release an exclusive version of Twister Dance, which includes a remix of "Till the World Ends". The singer was also featured on a commercial, which was directed by Ray Kay, to promote the game. Spears was also featured on the commercial of "Twister Rave" and the game included a Twister remix of "Circus".^[8] In March 2018, it was revealed that Spears would be the face of Kenzo, a contemporary French luxury clothing house.^[9]

Spears's range of commercial deals and products also includes beauty care products and perfumes. She released her first perfume, Curious, with Elizabeth Arden in 2004, which broke the company's first-week gross for a perfume. By 2009, she had released seven more perfumes including Fantasy.^[10][11] In 2010, Spears released her eighth fragrance, Radiance. In March 2011, company Brand Sense filed a lawsuit against Spears and Elizabeth Arden seeking $10 million in damages, claiming that she and her father, Jamie, stopped paying their thirty-five percent commission that was agreed as part of the contract terms.^{[12][unreliable source?]} In July 2011, a Los Angeles judge denied the request by the company lawyers, claiming the fact that Spears was still under conservatorship.^[13] Brand Sense, however, stated that they would appeal the decision.^[13] In 2011, Radiance was reissued as a new perfume titled Cosmic Radiance.^[14] Worldwide, Spears sold over one million bottles in the first five years, with gross receipts of $1.5 billion. In 2016, Spears contacted Glu Mobile to create her own role-playing game, Britney Spears: American Dream. The app officially launched in May 2016 and is compatible with iOS and Android. On June 17, 2016, Spears announced the release of her twentieth fragrance, Private Show.^[15] As of January 2018^[update], Spears has released 24 fragrances through Elizabeth Arden.^[16] In 2022, Spears signed a $15 million book deal with Simon & Schuster, for her upcoming memoir, The Woman in Me, set to be released in October 2023. It is one of the biggest book deals of all time.^[17]

Spears endorsed her first Elizabeth Arden perfume, Curious, in 2004, and made $100 million in sales in its first year.^[18] In September 2005, Spears released the fragrance Fantasy.^[19] In April 2006, Spears launched Curious: In Control as a limited edition fragrance. The same year, she released another perfume titled Midnight Fantasy. September 24, 2007 marked the release date of the fragrance collection Believe. She released her sixth perfume, Curious Heart, in January 2008. In December 2008, Spears released two more perfumes with the release of her sixth studio album, Circus. In 2009, Curious won the Glammy Award for Best Beauty Buy of 2009 by Glamour readers, for Best Drugstore Fragrance.^[20]

As of 2009, Spears claimed to have sold 30 million bottles worldwide.^[19] As of 2012, her fragrances brand had grossed over $1.5 billion worldwide.^[21] According to a Daily Express newspaper report in 2013, a bottle of a Spears fragrance was sold every 15 seconds worldwide.^[22] In 2018, Spears released her twenty-fifth and first ever unisex fragrance, Prerogative.^[23] As of July 2023, Spears has released 42 fragrances under her brand.

In March 2009, Spears was announced as the new face of Candie's, a clothing brand marketed for pre-teens and teenagers.^[39] After being the face of the line for two years, it was announced that Spears would design a limited edition collection for Candie's which would be unveiled by mid year.^[40] It premiered on July 1, 2010 with prices ranging from $14 to $78. In an interview with InStyle's website, Spears announced a few more pieces would be sold in September and October and that she would love to design for them again.^[41]

In August 2014, Spears launched an undergarment brand with the Danish company Change Lingerie, for sale online and in Change Lingerie stores.^[42]

Spears released a range of hair care products in the supermarket chain Lidl in England, in December 2014.^[45]

Spears has endorsed several brands throughout her career, including Pepsi, Polaroid, McDonald's, Hasbro, Versace, NFL, Skechers, Got Milk?, Tommy Hilfiger, Clairol, Herbal Essences, Samsung, Nabisco, Virgin Mobile, Zappos, Kenzo, Sbarro, ABC, HBO, Candies, Kohls, Starburst candy, Eos, iHeart Radio, Kirin Company, Apple Music, Disney, Los Angeles Dodgers, and Toyota.^[46] She has also included endorsements in her music videos for brands such as Bvlgari, Swarovski, Volkswagen, Mazda, MateFit, Plenty of Fish, Beats Electronics, Sony, Nokia, Lamborghini, and Samsung.^[47]