Alexander Lucian Dade (18 July 1863 – 8 January 1927) was a United States military officer.

He graduated from the United States Military Academy at West Point in 1887, where he was a classmate of future generals William Weigel and George Owen Squier.

While in the Philippines, Dade served on the staff of General Samuel Baldwin Marks Young as an inspector during expeditions in the Northern Luzon region.

Following the United States' entry into World War I, Dade was assigned to organize and head the Aviation Section of the Signal Corps on 11 April 1917.

The following year he was director of aviation training at the Central Department Headquarters in Chicago and promoted to brigadier general.