TLI

TLI may refer to:

• Thallium(I) iodide, a Thallium compound
• Transport Layer Interface, a networking application programming interface.
• Trans-lunar injection, a propulsive maneuver used to set a spacecraft on a trajectory which will arrive at the Moon.
• Tseng Laboratories, Inc., the full corporate name of Tseng Labs
• Tall Latte index, an economic index based on the cost of a cup of Starbucks coffee
• Taipei Language Institute, an institute for teaching Mandarin Chinese founded in 1956
• The Lonely Island, an American comedy troupe
• The Living Infinite
• Trophic level index, an index used in New Zealand for measuring the nutrient content of a lake
• Term Life Insurance
• Temporal light interference, undesired degradation or malfunction of an equipment or system caused by light modulations