Andrew Charles O'Dell FRSE FRGS FRSGS (1909–1966) was a Scottish geographer and antiquarian. A keen railway enthusiast he left a large collection of railway memorabilia to Aberdeen University, known as the O'Dell Collection. He was joint founder of the Institute of British Geographers in 1933. He was best known to the general public for his involvement in the discovery of the St Ninian's Isle Treasure in Shetland, in 1959.