TMM
TMM may refer to:

Science
Transfer-matrix method, a statistical mechanics method
Transfer-matrix method (optics), a method to describe wave propagation through stratified media
Trimethylenemethane, a reactive organic compound and a ligand in organometallic chemistry

Software and business
Tell Me More (software), French language-learning software from Auralog
Testing Maturity Model, a software process improvement model
Too Much Media, an American software company based in New Jersey
Traffic Management Microkernel, a product of F5 Networks
Translation memory manager, a software program to aid human translators

Other uses
Tell Me More, an American radio show on National Public Radio hosted by Michel Martin
Texas Memorial Museum, a museum at the University of Texas at Austin in the United States
Textbook of Military Medicine, a U.S. Army publication
Theresa May, a Prime Minister of the United Kingdom, from her full name Theresa Mary May
TMM, the former ISO 4217 code of the Turkmenistani manat, the currency of Turkmenistan
TMM-1 mine, an anti-tank landmine