The Marshall Mathers LP is the third studio album by the American rapper Eminem, released on May 23, 2000, by Aftermath Entertainment and Interscope Records. The album was produced mostly by Dr. Dre and Eminem, along with the 45 King, the Bass Brothers, and Mel-Man. Recorded over a two-month period in several studios around Detroit, the album features more introspective lyricism, including Eminem's thoughts on his rise from rags to riches, the criticism of his music, and his estrangement from his family and wife. A transgressive work, it incorporates horrorcore and hardcore hip hop, while also featuring satirical songs. The album includes samples or appearances by Dido, RBX, Sticky Fingaz, Bizarre, Snoop Dogg, Xzibit, Nate Dogg, and D12.

Like its predecessor, The Marshall Mathers LP was surrounded by significant controversy upon its release, while also propelling Eminem to the forefront of American pop culture. Criticism centered on lyrics that were considered violent, homophobic, and misogynistic, as well as a reference to the Columbine High School massacre. Future second lady Lynne Cheney criticized the lyrics at a United States Senate hearing, while the Canadian government considered refusing Eminem's entry into the country. Despite the controversies, it received widespread acclaim from critics, who praised Eminem's lyrical ability and considered the album to have emotional depth.

The album debuted at number one on the Billboard 200, staying atop for eight consecutive weeks. A significant commercial success compared to the release of The Slim Shady LP just the previous year, the album sold 1.78 million copies in its first week, which made it among the fastest-selling studio albums in the United States. The album produced the singles "The Real Slim Shady", "The Way I Am", and "Stan". Among other publications, Rolling Stone named it the best album of 2000.

The Marshall Mathers LP has been included in numerous all-time lists and is widely regarded as Eminem's greatest album. It has sold 25 million copies worldwide, making it one of the best-selling albums of all time, and is certified 11× platinum and Diamond by the Recording Industry Association of America (RIAA). It was nominated for Album of the Year and won Best Rap Album at the 2001 Grammy Awards, while "The Real Slim Shady" won Best Rap Solo Performance. The Marshall Mathers LP 2, the album's sequel, was released in 2013.