Lilian Jeannette Rice (June 12, 1889 – December 22, 1938) was an eco-conscious, early 20th-century American architect working primarily in the California Spanish Colonial Revival style. She was born in National City, California In 1906, she entered the University of California and successfully completed her Bachelor of Letters Degree in Social Science with a major in architecture in 1910. In 1921, Rice was chosen by Richard Requa, of the firm of Requa and Jackson, to be the lead planner on the new development at Rancho Santa Fe in San Diego County. Rice opened her own architectural firm in 1928, and would receive her architect's license the following year. She hired other women to work with her, including fellow Berkeley alumna Olive Chadeayne, who worked with Rice until her death.