LTR

LTR or similar may refer to:

Measurement

 * Ltr. (for 'litre' or 'liter'), a unit of volume
 * Letter (paper size)

Science and technology

 * Learning to rank, ordering data with machine learning
 * Left-to-right mark, a bidirectional control character
 * Load task register, a machine-code instruction
 * Logic Trunked Radio, a two-way radio system
 * Long terminal repeat, a DNA sequence

Other uses

 * Left to right, a directionality of writing systems


 * Little River railway station, Australia
 * London Turkish Radio, an Internet radio station
 * Long-term relationship