PTM may refer to:
Science and technology Polynomial texture mapping, a digital imaging technique Post-translational modification, covalent and generally enzymatic modification of proteins following protein biosynthesis by ribosomes Post-transition metal, a grouping of chemical elements Probabilistic Turing machine, in theoretical computer science Pulse time modulation, a pulse modulation method
Other uses Parent–teacher meeting, a meeting of parents with teachers to discuss the progress of school students President's Tatrakshak Medal, a military decoration of the Indian Coast Guard Pashtun Tahafuz Movement, a human rights movement in Pakistan for the Pashtun people Polygyny threshold model, a theory explaining polygyny Portugal. The Man, an American rock band Proto-Tungus–Manchu, another name for the Proto-Tungusic language