TTL may refer to:

Photography

* Through-the-lens metering, a camera feature * Zenit TTL, an SLR film camera named for its TTL metering capability

Technology

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

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