Luke Cornish (born 1979) is an Australian stencil artist, also known as E.L.K. In 2012 Cornish became the first stencil artist to become a finalist in the Archibald Prize.

Growing up in Canberra, Cornish worked as a sign writer and landscape designer before taking up stencil art as a hobby in the early-2000s. All of his work is done by hand through cutting out sheets of recycled acetate with a scalpel. Some of Cornish's stencils contain over 100 layers and up to 243 colours.

His artwork utilizes classical imagery as a vehicle to parallel modern phenomena with the age-old struggle for justice