Jan Conn (born c. 1924 ) and Herb Conn (April 16, 1920 - February 1, 2012) were climbing and caving pioneers. They are credited with establishing many classic climbs in areas like Carderock in Maryland, Seneca Rocks in West Virginia, Cannon Cliff in New Hampshire and Black Hills of South Dakota. They are also well known as cave explorers who in the 1960s and 70s discovered and mapped over 60 miles of Jewel Cave, making it the world's third longest cave system.