Josephine Koo Mei-Wah or Gu Meihua (Chinese: 顧美華) is a Chinese film actress. She had a bright start to her film career, starring in Yim Ho's Hong Kong New Wave classic Homecoming (1984). The film won her the Best New Performer Award at the Hong Kong Film Awards in 1985, and also a nomination for Best Actress, but she was beaten by Siqin Gaowa from the same film.
After Homecoming, Koo appeared in Yim Ho's Red Dust (1990), Stanley Kwan's Full Moon in New York (1990) and Evans Chan's To Live(e) (1992).
She disappeared from the screen in the late 1990s but suddenly returned in Peng Xiaolian's Shanghai Story (2004). For her role in this film, Koo was awarded the Best Actress Award at the Shanghai International Film Festival, beating out Zhang Ziyi and Joey Wong.