Marion Marie Stringer Darby (née Büchler, 2 August 1940 – 10 October 2019) was a New Zealand marine biologist and teacher. She was the first New Zealand woman to visit the Antarctic mainland. In January 1968, she travelled on the Magga Dan, the first tourist vessel to the Ross Sea, and visited Scott Base with other staff and tourists. She prepared a checklist of sub-Antarctic birds for the information of tourists on board and later wrote an article on summer seabirds to be seen between New Zealand and McMurdo Sound. Mt Darby in Antarctica is named after her.