LEO COSTELLOE (b. 1993, Canberra) is a London-based, Irish-Australian interdisciplinary artist whose work explores the transient and sentimental nature of objects in culture. Across sculpture, photography, moving image and writing, Costelloe draws from lexicons of digital and historical femininity, adornment, decoration, material traditions, and biographical detail. Working with glass, silversmithing, hair, flowers and found objects, Costelloe recasts familiar decorative and utilitarian signifiers and reframes objects’ presupposed meanings, using material dissonance to imbue banal items with emotional resonance and subtle subversion, unsettling conventional ideas of decoration, utility, gender, and class.

Costelloe has presented solo exhibitions at The Shop at Sadie Coles HQ, London (2025); NEVEN, London (2024); Ridley Road Project Space, London (2022) and Kupfer, London (2023). Their work has been featured in group exhibitions at 4COSE, London, curated by Rose Higham-Stainton and Iska Lupton (2026); DKUK, London, curated by Mariana Lemos and Dot Jia (2026); Felix Art Fair, Los Angeles (2026) with Carlye Packer; ZÉRUÌ, London (2026); CAIM, Slane Castle, Ireland (2025); NADA New York (2025); Matt Carey-Williams, London (2024); Studio West Gallery, London (2024); Indigo + Madder, London (2023); The Stanley & Audrey Burton Gallery, Leeds (2023); General Assembly, London (2023); Kupfer, London (2023); Photobook Gallery, London (2023); and Ridley Road Project Space, London (2022). In 2025, Dean's Bottom published a book of prose and photography by Costelloe called Kitchen. In 2026, Tate Britain commissioned Costelloe to write an accompanying text for Art Now: Mohammed Z Rahman, curated by Hannah Marsh. Costelloe graduated from Central Saint Martins with a BA (Hons) in Jewellery Design and were awarded the Swarovski Scholar Award in 2020.