Julia Barfield,, is a British architect and director of Marks Barfield Architects, established in 1989. Barfield created the London Eye together with husband and partner David Marks. Barfield has interest in vernacular architecture, geometry and in the way nature "designs and organizes itself so efficiently". She was influenced by Buckminster Fuller and his beliefs on how architects have a social and environmental responsibility. Barfield remains involved in a diverse array of projects within architecture, including the categories of culture, education, transportation, sports, leisure, and master planning.

Marks Barfield Architects is a London-based architectural firm founded by husband and wife David Marks and Julia Barfield. Their work has included the London Eye, the treetop walkway in Kew Gardens, the i360 observation tower in Brighton, England and Cambridge Central Mosque.