Leif Allansson is a Swedish sound engineer, producer, and musician, primarily active during the 1970s and 1980s. He is particularly known for his work at Europa Film Studio in Stockholm, where he was part of a prominent sound team that included Leif Mases and Michael B. Tretow. Throughout his career, Allansson worked with a number of leading Swedish artists and bands. He served as engineer and mixer on several of Janne Schaffer's albums, including Music Story (2010), contributing to recordings at both Europa Film Studio and Polar Studios. He also worked as an engineer on the album Knivhuggarrock (1975) by Tomas Ledin's band, collaborating with producer Tomas Ledin and engineer Anders Larsson. Furthermore, he was involved as engineer and mixer on Sven-Ingvars' album Retroaktiv (2000), working alongside producer Micke Nord Andersson. In addition to his work in music production, Allansson has also been active in the film industry. He served as technician and sound engineer on several films, including Morfars resa (1993), Expectations (1997), and The Health Journey (1999). He also appeared as himself in the documentary Det finns så många vägar – en film om John Holm (2020), where he shared his experiences from the world of music. Following his active career in music and film production, Allansson has remained engaged in the music industry. Among other projects, he worked with the band Neweva from Värnamo, producing their EP. He has also participated as a speaker at conferences such as Future Echoes, where he discussed the evolution of music production and his own career.