"Last Farewell" (Korean: 마지막 인사; Revised Romanization: Majimak Insa) is a song by South Korean boy band Big Bang. It was released through YG Entertainment on November 22, 2007 as the lead single from the quintet's second extended play Hot Issue. The song was written by G-Dragon and composed by the member and Brave Brothers. Mirroring the success of the group's preceding single "Lies," the song went on to become a chart topper.

With the release of their first extended play, Always in 2007, Big Bang began to experiment more with their sound, moving away from their original hip hop roots. Their second EP, Hot Issue, released that same year, followed its predecessor's success. "Last Farewell," the lead single, was described by Billboard as a "trance-tinged hip pop" song. It topped various charts upon its release, including the Juke-On's music chart for eight consecutive weeks. It also garnered the Song of the Month (Digital Music) Award from Cyworld, leading Hot Issue's sales to moved over 120,000 copies total in South Korea. A Japanese-language version of the song named "Baby Baby" was included in the quintet's first and second Japanese albums Number 1 and Big Bang, as well in their greatest hits album The Best of Big Bang 2006-2014. Reception for the song was positive, with Billboard complimenting its "catchy chorus" and "pump-up dance beat" while the The Chosun Ilbo praised its "addictive chorus" and the dance moves that accompanied it. "Last Farewell" is recognized as one of the group's definitive songs, for setting the direction they would eventually go in on songs like "Fantastic Baby" and "Bang Bang Bang". The song ranked at number four in Melon's decade end chart.

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