8V
8V or 8-V may refer to:
- Antoinette 8V, a 1907 French engine
 - Fiat 8V, a 1952 sports car
 - HF Integrale 8v, a model of Lancia Delta
 - 8v, abbreviations for 8 volts
 - 8V, abbreviation for 8-valve engine
 - Octavarium (album), an album released by Dream Theater
 - B-8V, a model of Bensen B-8
 - 8v, a model of Ford Duratec engine
 - 8V-71, engine used in Detroit Diesel Series 71
 - 8V-72, engine used in Detroit Diesel Series 92