Lorraine Jeanette Day (born July 24, 1937) is a US author, former orthopedic trauma surgeon and Chief of Orthopedic Surgery at San Francisco General Hospital and promoter of alternative cancer treatments.
She first became controversial when she began advocating that patients be tested for AIDS prior to surgery.
In the 2000s she started to promote an alternative cancer treatment program, which has attracted criticism as being misleading and dangerous.