Theisen

Theisen is a surname. Notable people with the surname include:


 * Brianne Theisen (born 1988), Canadian heptathlete and women's pentathlete
 * Joseph M. Theisen (1877–1946), American politician
 * Paul Theisen (born 1922), Danish fencer
 * Roger Theisen (born 1932), Luxembourgian fencer
 * William Theisen, American restaurant entrepreneur