Alfred van der Smissen (February 1, 1823-June 16, 1895) was the commander of the Belgian Expeditionary Force during the French intervention in Mexico.
Smissen joined the Belgian army in 1843, and in 1851 he served against the Algerian rebellion. When Maximilian I of Mexico and his wife Charlotte of Belgium traveled to the country to settle a succession dispute, Leopold I of Belgium organized an expeditionary army under command of Smissen, who had served in most of the Belgian colonial campaigns of the century. His forces sustained heavy casualties on April 11, 1865, at the Battle of Tacambaro where his adjutant Captain Tigdal was killed. He had never experienced real fire, and his army was eliminated by the republicans. In 1866, he was promoted to colonel and he left Mexico for Europe after several cautious campaigns against the rebellion of the Mexican government loyalists. When he returned, it was alleged and almost certain that French general Maxime Weygand was parented by Smissen, who had an affair with Charlotte. However, Weygand continued to deny that he was the illegitimate son of the couple. He died 1895 in Brussels.