Millen is a surname. Notable people with the surname include:
Ari Millen, Canadian actor
Corey Millen (born 1964), retired American ice hockey player
Edward Millen (1860–1923), Australian politician
Greg Millen (born 1957), Canadian ice hockey player
Karen Millen, fashion designer
Matt Millen (born 1958), former president and CEO of American football team Detroit Lions
Rhys Millen, New Zealand rally and drifting driver
Rod Millen (born 1951), New Zealand rally driver and vehicle designer
Steve Millen (born 1953), New Zealand IMSA racecar driver
