Best of The Rasmus 2001–2009, also referred to as Best of.. 2001-2009 is a compilation album by the Finnish alternative rock band The Rasmus, it was released on November 2, 2009. The album contains the best songs between 2001 and 2009. While most of the songs were already released, it features a new unreleased song called "October & April" which features vocals by Anette Olzon from Nightwish. This song was recorded during the same time as the other songs from the band's latest studio album Black Roses, but wasn't included as it didn't follow the album concept.

The Rasmus is a Finnish rock band that formed in 1994 in Helsinki while the band members were in upper comprehensive school. The original band members were Lauri Ylönen, Eero Heinonen (bass), Pauli Rantasalmi (guitar) and Jarno Lahti (drums). Jarno Lahti left the year after and was replaced by Janne Heiskanen in 1995. Heiskanen quit the band in 1999 and was soon replaced by Aki Hakala. Pauli Rantasalmi left the band and was replaced by guitarist Emilia "Emppu" Suhonen in 2022. Best known for their 2003 hit single "In the Shadows", the band has sold over 5 million albums worldwide and 350,000 albums in Finland alone, and has won numerous awards, both domestic and international. The band represented Finland in the Eurovision Song Contest 2022 with the song "Jezebel".