Cheng Siu-keung (simplified Chinese: 郑兆强; traditional Chinese: 鄭兆強, born July 21, 1952), also credited as Alan Cheng or Milo Cheng, is a Hong Kong cinematographer, screenwriter, and director. He is known for frequently collaborating with directors Johnnie To and Wai Ka-Fai as a cinematographer for their independent film production company, Milkyway Image.