Sia Kate Isobelle Furler (born 18 December 1975), known professionally as Sia (/ˈsiːə/), is an Australian singer, songwriter and music video director. Musically and artistically precocious, Sia became interested in performing in the style of musicians including Aretha Franklin, Stevie Wonder and Sting. In the mid-1990s, Sia started a career as a singer in the local Adelaide acid jazz band Crisp. By 1997, when Crisp disbanded, Sia released her debut studio album titled OnlySee on Flavoured Records in Australia. Following the event, Sia moved to London, England and provided lead vocals for British duo Zero 7.

In 2000, Sia signed to Sony Music's sub-label Dance Pool and released her second studio album, Healing Is Difficult, the following year. Displeased with the promotion of the record, Sia signed to Go! Beat and released her third studio album, Colour the Small One, in 2004. Dissatisfied with the project's struggling to connect with a mainstream audience, Sia relocated to New York City in 2005 and began touring across the United States. Sia released her fourth and fifth studio releases, Some People Have Real Problems and We Are Born, in 2008 and 2010, respectively. In 2014, Sia released her sixth studio album, 1000 Forms of Fear, which was preceded by the top-ten single "Chandelier". She is currently working on her seventh studio album This Is Acting.

Sia's music incorporates hip hop, funk and soul as a base for her vocal styling. In 2014, she was ranked the 97th richest Australian person under the age of 40 by BRW magazine, with a reported net worth of AU$ 20 million.