Eilish will perform at The Tuning Fork in Auckland on September 11 ahead of her debut EP, don't smile at me.
She's only released a handful of singles so far, including Bellyache, Ocean's Eyes and Copycat, as well as Bored, which featured on the Netflix show 13 Reasons Why.
Each song has already chalked up millions of plays on YouTube and streaming services.
Tickets for her "intimate" show go on sale on July 26.