O Sonfa (? ??, Japanese: ?ยท????, born 15 September 1956), commonly known as her Korean name Oh Seon-hwa (Korean: ???), is a professor at Takushoku University, also active as an author and journalist in Japan.
Originally from Jeju-do, South Korea, she left for Japan in 1983 and went on to naturalise as a Japanese citizen.
In 1998, she lost her South Korean nationality as she had acquired Japanese nationality in 1991.
In 2007 and 2013, she was refused entry to South Korea.