Joseph Knaffl (October 9, 1861 – March 23, 1938) was an American art and portrait photographer, active in Knoxville, Tennessee, during the late 19th and early 20th centuries.
He is best known for his 1899 portrait, "Knaffl Madonna," which has been reprinted thousands of times, and is still used for Hallmark Christmas cards.
Knaffl was a partner in two Knoxville studios: Knaffl and Brother, formed in 1884, and Knaffl and Brakebill, formed in 1909.