| Cipher System / By Night | |
| Type: | ep |
| Artist: | Cipher System and By Night |
| Cover: | Cipher_system_and_by_night_split.jpg |
| Released: | June 18, 2004 |
| Genre: | Death metal, extreme metal |
| Length: | 21:35 |
| Label: | Lifeforce |
| Chronology: | By Night |
| Next Title: | Burn the Flags |
| Next Year: | 2005 |
Cipher System / By Night is an EP by the Swedish metal bands Cipher System and By Night. Released in 2004.
Tracks one to three are by Cipher System. Tracks four to six are from By Night.