TTL

TTL may refer to:

Photography

 * Through-the-lens metering, a camera feature that permits light metering through the taking lens itself, rather than via a separate window
 * Zenit TTL, an SLR film camera, named for its introduction of TTL metering to the Zenit camera line

Technology

 * Time to live, a mechanism that limits the lifespan of data in a computer or network
 * Transistor–transistor logic, a family of integrated-circuit digital logic
 * Differential TTL, a serial signaling standard based on a transistor–transistor logic interface
 * Turtle (syntax), a computer data format used in semantic web technologies

Other uses

 * Taiwan Tobacco and Liquor, a state-owned manufacturer of cigarettes and alcohol
 * "TTL (Time to Love)", a single by South Korean girl group T-ara and boy band Supernova