Ituna Valley is a narrow ice-free valley between Isca Valley and Lemanis Valley in the Britannia Range, Antarctica. The valley opens northward to Hatherton Glacier, 8 miles (13 km) west-northwest of Derrick Peak. It was named in association with "Britannia" by a University of Waikato geological party, 1978–79, led by M.J. Selby.