John Greg Ganske (born March 31, 1949) is an American politician, plastic surgeon, and retired U.S. Army reserve lieutenant colonel from Iowa.

He earned honors in wrestling in high school, and was an American Field Service exchange student to Costa Rica in 1966.

Ganske worked as a plastic surgeon in Des Moines until he challenged veteran Democratic Congressman Neal Smith in 1994.

Ganske campaigned in a cream 1958 DeSoto (Smith having won his first congressional race in that year), playing songs from that era.

However, Ganske's home city of Des Moines was drawn into the 3rd district, represented by Democrat Leonard Boswell.