William Swenson (born October 26, 1973 in Provo, Utah) is an American Tony Award-nominated actor, writer and film director best known for his work in musical theatre. He also has developed a cult film career, primarily in Mormon cinema. He is well known amongst Utahn Mormons, particularly for his role as Jonathan Jordan in the LDS Cinema movie The Singles Ward (2002) and in the Singles Ward sequel, The Singles 2nd Ward (2007). Swenson also co-wrote, directed and acted in the LDS Cinema movie Sons of Provo (2004).

A grandson of Ruth Hale, Swenson was born to a theatre-loving Mormon family in Utah and moved around a lot throughout the United States during his childhood. He attended Brigham Young University and later served as an LDS missionary in Ecuador. However, he is no longer a practicing Mormon.