Birte Christoffersen was a Danish-Swedish diver. She competed in the 3 m springboard and 10 m platform for Denmark at the 1948 Summer Olympics and for Sweden at the 1956 & 1960 Summer Olympics. She won a bronze medal in the platform in 1948 and finished in 8–12th place on other occasions. From December 2025 until her death, she was the oldest known living Olympic medalist.