T. Thomas and Son was the American architectural firm of Thomas Thomas and his son Griffith Thomas. The firm is known for designing the Italian palazzo style architecture style Hay House (Johnston-Felton-Hay House) in the 1850s and First Baptist Church (New Bern, North Carolina) (1848), an early non-Episcopalian Gothic Revival architecture church for North Carolina. Thomas Thomas a founder of the American Association of Architects in 1837.