Lux Guyer (1894–1955) was a pioneering Swiss architect, recognized as the first woman in Switzerland to establish her own architectural practice in 1924. Born in Zurich, she studied interior design and architecture, gaining experience through apprenticeships in Zurich and Berlin, and study trips to Paris, London, and Florence. Guyer is best known for her role as the head architect of the 1928 SAFFA women's fair in Bern, where she designed innovative buildings using prefabricated wooden elements. Her notable projects include the Lettenhof housing development for women in Zurich (1927) and the Obere Schiedhalde house in Küsnacht (1929). Guyer’s work significantly contributed to early 20th-century Swiss architecture, emphasizing functional design and social considerations.