Ann Mui Oi-fong (梅愛芳) (10 December 1959 – 16 April 2000) was a Hong Kong singer and actress.

Her father died when she was very young and her mother, Tam Mei-kam, raised four children alone.

Like her sister Anita, Ann had a dramatic contralto singing voice, which is a rarity in Chinese pop music.

Despite not being twins, both Ann and Anita's singing voices were strikingly similar, with the only way to tell them apart was the hand in which they hold the microphone.

[1][dubious – discuss] She is best remembered for her supporting roles in many movies, especially Jackie Chan's Police Story 2.