Alfred L. Buchan (March 4, 1847 – February 17, 1905) was an American physician and politician. Born in what is now the town of Dover, Racine County, Wisconsin, Buchan received his Master of Arts degree from Monmouth College and then graduated from Rush Medical College and Bellevue Hospital and College. He then practiced medicine in Union Grove, Wisconsin and Racine, Wisconsin. In 1889, Buchan served in the Wisconsin State Assembly and was a Republican. Buchan died of cancer in his home in Dover, Wisconsin.