Greatest Lovesongs Vol. 666 is the debut studio album by Finnish gothic rock band HIM. The album was recorded in fifteen days during the summer of 1997 with producer Hiili Hiilesmaa, whom vocalist Ville Valo has credited as the honorary sixth member of the band due his help in honing the band's sound, and released on 3 November 1997. Musically Greatest Lovesongs Vol. 666 has been described as a combination of heavy metal and 1980s rock and goth, with lyrics centered around themes of love and death. The album also features the only writing credits from guitarist Mikko "Linde" Lindström in the band's history, and is their only album to feature keyboardist Antto Melasniemi and drummer Juhana "Pätkä" Rantala.

HIM was a Finnish gothic rock band from Helsinki. First formed in 1991 by vocalist Ville Valo and bassist Mikko "Mige" Paananen under the name His Infernal Majesty, the band broke up after only a few years, only to be reformed in 1995 by Valo and guitarist Mikko "Linde" Lindström. After being rejoined by Mige, as well as keyboardist Antto Melasniemi and drummer Juhana "Pätkä" Rantala, the band, now called HIM, released its debut album Greatest Lovesongs Vol. 666 in 1997. In 2000, now with drummer Mika "Gas Lipstick" Karppinen and keyboardist Juska Salminen, the band released Razorblade Romance, which reached the number one spot in Finland, Austria and Germany. The first single "Join Me in Death" also charted at number one in Finland and Germany, eventually going platinum and gold, respectively. Following the addition of Janne "Burton" Puurtinen on keyboards, HIM released Deep Shadows and Brilliant Highlights (2001) and Love Metal (2003). Both cracked the top ten in several countries and allowed the band to tour in the United Kingdom and the United States for the first time.