MTL

An abbreviation and nickname for the city of Montreal, Quebec
The Montreal Canadiens, a National Hockey League team based in Montreal.
CF Montréal, a Major League Soccer team based in Montreal.
The Montreal Alouettes, a Canadian Football League team based in Montreal.
An abbreviation of Mount Laurel Township, New Jersey
The official abbreviation for the Muldentalkreis district in the Free State of Saxony, Germany
The ISO 4217 code for the Maltese lira, the former currency of Malta
First language or mother tongue language
Master of Teaching and Learning postgraduate degree
Mary Todd Lincoln (1818–1882), wife of Abraham Lincoln and the First Lady of the United States
Maitland Airport in Australia
Mortlake railway station in London, England (National Rail station code)
RAF-Avia, ICAO code
An initialism for Military Training Leader
Marc Tessier-Lavigne, the 11th President of Stanford University
Materials Technology Laboratory, a defunct research facility under the United States Army Materiel Command

Science and technology

Machine translation, often abbreviated as "MTL"
Material Template Library, a 3D graphics format that describes the material(s) for an accompanying OBJ file
Matrix Template Library, a linear algebra library for C++ programs
Meteor Lake, a CPU lineup from Intel
Microsystems Technology Laboratories at the Massachusetts Institute of Technology
Model transformation language, a generic term for various languages to perform transformations on mathematical models
Monoidal t-norm logic, the logic of left-continuous t-norms
Japan Median Tectonic Line, Japan's largest seismic fault system
Medial temporal lobe, a brain region involved in learning and memory
Merged transistor logic, a class of digital circuits
Metric temporal logic, in computer science
Multi-task learning
MTL Harbor Tugboats

Modern Terminals Limited, a container terminal operator in Hong Kong
MTL (transport company), a former Merseyside-based bus, coach and train operator in the United Kingdom
MTL Instruments Group