Ilgenfritz

Ilgenfritz is a surname. Notable people with the surname include:
 * Alice Ilgenfritz (1846–1906), American writer and novelist
 * Charles H. Ilgenfritz (1837–1920), American Civil War soldier
 * James Ilgenfritz (born 1978), American composer, bassist, and multi-instrumentalist
 * Mark Ilgenfritz (born 1952), American football defensive end
 * William Ilgenfritz (born 1946), American Anglican bishop
 * Wolfgang Ilgenfritz (1957–2013), Austrian politician