Milly may refer to:
- Milly Bernard (1920-2005), five-term member of the Utah House of Representatives
- Milly Childers (1866-1922), English painter
- Milly Quezada (born 1955), Latin American singer
- Milly Witkop (1877-1955), Ukrainian-born Jewish anarcho-syndicalist and feminist writer and activist
- Milly, female lead character in Seven Brides for Seven Brothers (musical) and Seven Brides for Seven Brothers (film)
- Milly Theale, major character in the Henry James novel The Wings of the Dove
- Milly, a puppet on YouTube created by The Fine Bros and Shane Dawson, for a new show and channel named "Hey It's Milly", voiced by Benny Fine.
- Milly, Manche, a commune in France
- Milly (actress) (1905–1980), stage name of Carla Mignone
- AEC Militant, a post-war artillery tractor