| L/T | Less Than | |
| LT | Lot | |
| LT | Long-Term | |
|
| LT | Long-Time | |
| LT | Less Than (computer math) | |
| LT | Lithuania (ISO Country Identifier) | |
| LT | Low Temperature | |
| LT | Luxury Touring (automotive model/feature) | |
| LT | Look Through (Intelligent Jammers) | |
| LT | Looney Tunes | |
| LT | Lote (Portuguese: lot; postal usage) | |
| LT | Lucent Technologies | |
| LT | Low Tension | |
| LT | Lower Tray | |
| L/T | Lead time (product delivery) | |
| LT | Limited Too (store) | |
|
| LT | Lung Transplantation | |
| LT | Lost Temple (gaming) | |
| LT | Latina, Lazio (Italian province) | |
| LT | Lorentz Transformation | |
| LT | Lorien Trust | |
| LT | Lifetap (MMORPG games) | |
| LT | Last Telecast | |
| LT | Los Alamos Technical Associates | |
| L/T | Length to Thickness ratio | |
| LT | Lufttransport AS (Norway) | |
| LT | Lactate Threshhold | |
| LT | Long-Range Transmitter | |
| LT | Lockout/Tagout Training | |
| LT | Laser Trooper (Star Kingdoms game) | |
| L/T | Lead Trail | |
| LT | Loudest Talker (voice conferencing algorithm) | |
| LT | Linetroll (Fault Passage Indicator; Nortroll AS, Norway) | |
| L/T | Lettertainer (Canada Post) | |
| LT | LON-Talk Protocol | |
| LT | Turn Left After Takeoff | |
| LT | Lubrication Threads (SAE) | |
| LT | Lamar Transform | |
| LT | Landing Team | |
| LT | Landtag (Legislative Body, Austria, Europe) | |
| LT | Laplace Transform (mathematics) | |
| LT | Laptop | |
| LT | Large Tug (US Army) | |
| LT | Las Trampas (California) | |
| LT | Lashkar-e-Tayyiba (Kashmiri-focused militant group) | |
| L/T | Long Ton (measurement) | |
| LT | L-Tryptophan (amino acid) | |
| LT | Ladanian Tomlinson (football player) | |
| LT | Lady of the Thistle | |
| LT | LaGrande Technology (Intel) | |
| LT | Lake Tahoe (California/Nevada) | |
| LT | Lake Terminal Railroad Company | |
| LT | Lakeland Terrier | |
| LT | Laundry Tray | |
| LT | Laut (German: according to) | |
| LT | Lawrence Taylor (football player) | |
| LT | Lead Technician | |
| LT | Lead Time | |
| LT | Leadership Team | |
| LT | Leadership Trainer | |
| LT | Leak Testing | |
| LT | Learning Technologies (various organizations) | |
| LT | Lecture Theatre | |
| LT | Left | |
| LT | Left Tackle (football) | |
| LT | Left Turn (Hyper Logo Turtle graphics command) | |
| LT | Leicester | |
| LT | Length of Track | |
| LT | Lesotho | |
| LT | Link Text (message boards) | |
| LT | Linus Torvalds (developer/author of the Linux Kernel) | |
| LT | Liquid Thinking (web integration, design and consulting company) | |
| LT | LiteFuze Transformer | |
| LT | Lindsay Taylor (basketball) | |
| LT | Line Terminal | |
| LT | Line Type (AutoCAD) | |
| LT | Linear Technology | |
| LT | Linear Transformation (linear algebra) | |
| LT | Liner Terms (shipping) | |
| LT | Lodge Treasurer (Order of the Arrow, Boy Scouts of America) | |
| LT | Logic Theory | |
| LT | Logical Topology | |
| LT | Logitech | |
| LT | Live Training | |
| LT | Live Trend | |
| LT | Local Time | |
| LT | Last Trade (or trading day) | |
| LT | Latching | |
| LT | Latent Trait | |
| LT | Latest Thinking | |
| LT | Light | |
| LT | Light Tank | |
| LT | Light Truck | |
| LT | Light Trucks | |
| LT | Limited Term | |
| LT | Less Than or equal to (computer math) | |
| LT | Letter of Transmittal | |
| LT | Leukotriene | |
| Lt | Leutnant (German: second lieutenant) | |
| LT | Level Transmitter | |
| LT | Lieutenant | |
| LT | Life Threatening | |
| LT | Low Testosterone | |
| LT | London Transport | |
| LT | Long Text | |
| LT | Long Ton | |
| LT | Long Tour | |
| LT | Long Trail | |
| LT | Long Transverse (raw metal piece width) | |