"Diamonds from Sierra Leone" is a song by American rapper Kanye West from his second studio album, Late Registration (2005). The song was produced by West, Jon Brion, and Devo Springsteen. The producers, with the exception of Brion, are credited as songwriters alongside John Barry and Don Black, who both received credit due to their composition being sampled. The song was initially centered around the demise of Roc-A-Fella Records, though was later re-recorded once West learned about blood diamonds in Sierra Leone. West premiered the song for Hot 97 on April 20, 2005, before it was sent to US mainstream radio stations the following month as the album's lead single, through Roc-A-Fella and Def Jam. In the chorus, West interpolated the phrase "forever ever, forever ever" from OutKast's "Ms. Jackson".

Blood diamonds are diamonds mined in a war zone and sold to finance an insurgency, an invading army's war efforts, terrorism, or a warlord's activity. The term is used to highlight the negative consequences of the diamond trade in certain areas, or to label an individual diamond as having come from such an area. Diamonds mined during the 20th–21st century civil wars in Angola, Ivory Coast, Sierra Leone, Liberia, Guinea, and Guinea-Bissau have been given the label. The term conflict resource refers to analogous situations involving other natural resources. Blood diamonds can also be smuggled by organized crime syndicates so that they could be sold on the black market.