Luke Robert Hemmings (born 16 July 1996) is an Australian singer and musician, best known for being the lead vocalist, rhythm guitarist, and a founding member of the pop rock band 5 Seconds of Summer.

When Facing the Things We Turn Away From debuted atop the ARIA Albums Chart and peaked within the top 20 in Belgium and the United Kingdom.

[8] His father—Andrew Hemmings—was previously employed as a maintenance worker, while his mother—Liz Hemmings (née Pascoe)— is a former accountant turned high school mathematics teacher, now working in photography.

[9][10] Hemmings has two older brothers: Ben and Jack, both who previously worked as builders, with the latter now owning a street-wear clothing label.

[8] Following the band's rise to fame, Hemmings continued with his high school education, opting to switch to distance learning.

The trio eventually added mutual friend Ashton Irwin to their videos, forming the current 5 Seconds of Summer lineup.

[20][21] In February 2019, Hemmings attended New York Fashion Week,[22] debuting as a model and walking the runway for Philipp Plein's Autumn/Winter 2019 Ready-To-Wear collection.

[32] On 8 June 2021, Hemmings posted on his Instagram account announcing his engagement to his girlfriend of three years, Sierra Deaton.