Giuseppe Mariani (25 February 1885 – 28 December 1963) was an Italian dermatologist and medical researcher. During World War I he received the Silver Medal of Military Valor while attempting to rescue injured soldiers. After the war he returned to his work on dermatology and eventually moved to the University of Genoa where he chaired the department of dermatological studies and ran its clinic. He used the city's 's leprosarium to hide Jews from deportation to Germany during the Holocaust. He retired from the University in 1955, but continued to publish research during his retirement.