Meir Lahav (Hebrew: מאיר להב; born 1936 in Sofia, Bulgaria) is an Israeli chemist and materials scientist.
He studied at the Hebrew University of Jerusalem, where he obtained a master's degree in polymer chemistry in 1962.
As a postdoctoral fellow, Lahav worked with Paul Doughty Bartlett at Harvard University, among others, before returning to Israel in 1971.
He investigated crystallization and interface phenomena such as the packing of amphiphilic molecules at the phase boundary and the basis for heterogeneous catalysis.
He sought to understand biomembranes and designed self-assembling Langmuir-Blodgett layers (see self-assembling monolayer), investigated reaction pathways through asymmetric transformations into chiral and centrosymmetric crystals, guest-host interactions in organic solids, the correlation of macroscopic phenomena with molecular chirality, as well as stereochemical and regiospecific photoreactions within organic solids.