TLT may refer to:
Organizations Tallinna Linnatranspordi AS, an Estonian transportation company
Transportation Tai Lam Tunnel, a transport tunnel part of Route 3 in Hong Kong Tuluksak Airport, Alaska (IATA code TLT)
Other uses Test loop translator, a type of radio frequency converter Timor Leste Time, the time zone of East Timor, UTC+9:00 Sepa-Teluti language of Indonesia (ISO-639 code "tlt") The Living Tombstone, an Israeli-American electronic rock band on YouTube The Locked Tomb, a gothic horror/science fantasy novel series by Tamsyn Muir Trademark Law Treaty (1994)