Warren and Mahoney is an international full-service architecture and design practice - one of the few fourth generation architectural practices globally. It is a highly awarded architectural practice, with offices in New Zealand and Australia. It was recognised in 2023 as 'one of the world's most innovative architecture practices' for "creating a comprehensive indigenous design focus relevant to its work in New Zealand and beyond".

The practice was founded by Miles Warren in 1955, and with the award of the Dental Nurses Training School (now known as Central Nurses' Training School) Miles sought the assistance of his fellow atelier colleague Maurice Mahoney. In 1958, the partnership of Warren and Mahoney was established.

Since then, the practice expanded across New Zealand, opening major studios in Auckland, Wellington, Tauranga, Dunedin, and Queenstown. In 2000, Warren and Mahoney opened studios in both Sydney and Melbourne as a result of winning major contracts and competitions in each location. In Australia is has subsequently delivered major and award-winning projects such as the Northcote Aquatic Centre which won the Best in Category - Architectural Design award at the Victorian Premier's Design Awards.

Now a fourth-generation multi-disciplinary practice, Warren and Mahoney is one of the largest, most technically advanced and most awarded architectural practice in Australasia, offering comprehensive design services including: architecture, interior design, landscape architecture, masterplanning and urban design, digital design and BIM, sustainability, graphic and wayfinding design, visualisation, and an in-house Indigenous Design Unit.

The partnership between Maurice and Miles created a distinctive form of architecture utilising a modern, brutalist style (described by Warren himself as "constructivist") involving widespread use of concrete and harsh geometric shapes, that became known as Christchurch School. Several of their buildings in this style are now among the highlights of New Zealand modernism: Christchurch Town Hall, Harewood Crematorium, College House and Canterbury Students' Union being but a few. The style was influential within New Zealand, being a partial inspiration for Ted McCoy's Archway Lecture Theatre complex at the University of Otago, among other works.

Miles Warren was knighted in 1985 for his services to architecture and in 2003 named one of ten inaugural ‘Icons of the Arts’ by the Arts Foundation of New Zealand. Sir Miles Warren and Maurice Mahoney retired in the early 1990s.

For three consecutive years, Warren and Mahoney has received both WAF and WAFx awards from the World Architecture Festival, recognising its work in projects that apply design and innovation to address major global challenges. The practice’s recent WAF accolades include the 2025 Sport Architecture Award for the Hiwa University of Auckland Recreation Centre and 2024 Higher Education and Research Award for the Waimarie Lincoln University Science Facility. Their recent WAFx awards include the 2024 Future Education Award for University of Sydney First Nations College, 2023 Future Health Award for Alexandria Health Centre, and 2022 Future Infrastructure Award for North East Link.

Designed by Warren and Mahoney, Flockhill Lodge, also known as Flock Hill Station, is a 36,000‑acre luxury lodge and historically significant working sheep station located in New Zealand’s South Island. It has been recognised by international publications, including The Financial Times, which has described it as “the chicest sheep station in the world.”