Gaisser Valley () is a mostly ice-free valley, long, that descends south from Vashka Crag in the Cruzen Range of Victoria Land. The valley is bounded to the east by Peterson Terrace and terminates as a hanging valley northwest of Lake Vashka. Named by the Advisory Committee on Antarctic Names in 2005 after Thomas K. Gaisser, Bartol Research Institute, University of Delaware; United States Antarctic Program principal investigator for the study of cosmic-ray showers at the Amundsen-Scott South Pole Station from 1991 to 2005.