Lewis Buckley Stillwell (March 12, 1863 – January 19, 1941) was an American electrical engineer and the president of American Institute of Electrical Engineers (AIEE) from 1909 to 1910. He received the AIEE Lamme Medal (1933) and the AIEE Edison Medal (1935), for "his distinguished engineering achievements and his pioneer work in the generation, distribution, and utilization of electric energy." He also was inducted into the IEEE's Electrical Engineering Hall of Fame. His papers (1886-1939) are held in the Manuscript Division of the Princeton University Library. He was elected as a member of the National Academy of Sciences in 1921.