Training Day may refer to:
- Inset day, teacher in-service training day, in United Kingdom schools
- Training Day, a 2001 American crime thriller film
- Training Day (soundtrack), soundtrack of the film above
- Training Day (TV series), CBS TV series based on the 2001 film
- "Training Day" (Archer), second episode of the animated comedy Archer
- "Training Day" (The Office), 19th episode of the seventh season of the American comedy TV series The Office
- "Training Day" (Arrow), an episode of the CW series Arrow
- "Training Day", a season 5 episode of The Loud House
- Training Day (album), 2007 album, the second by hip hop duo The Away Team
- Training Day (Potter Payper album), 2013 album, first of the Training Day album trilogy by Potter Payper