William Lassiter (September 29, 1867- March 29, 1959) was a career in the United States Army. He was a veteran of the Spanish–American War, Occupation of Veracruz, World War I, and Occupation of the Rhineland and attained the rank of major general. Lassiter retired in 1931 as a major general and became a resident of Santa Barbara, California. He died in Santa Barbara on March 29, 1959 and was buried at Santa Barbara Cemetery.