In　this　article,　the　nonlinear　postbuckling　behavior　of　the　magneto-electro-thermo-elastic　(METE)　laminated　microbeams　is　presented.　According　to　the　modified　couple　stress　theory　(MCST)　and　Reddy＇s　three-order　shear　deformation　theory　(RTSDT),　in　conjunctions　with　the　von　Karman　geometric　nonlinearity,　the　nonlinear　static　model　of　METE　laminated　microbeam　is　established.　The　nonlinear　governing　equations　and　the　corresponding　boundary　conditions　are　derived　by　using　the　principle　of　virtual　work　principle.　Afterwards,　using　an　analytical　method,　the　nonlinear　postbuckling　behavior　of　METE　laminated　microbeam　with　simple　supported　and　clamped　boundary　conditions　at　the　both　ends　is　described.　Moreover,　numerical　examples　are　exhibited　to　reveal　the　effects　of　the　material　length　scale　parameter,　slenderness　ratio,　temperature　rise,　magneto-electric　potential　on　the　critical　buckling　load　and　the　nonlinear　postbuckling　response.　Also　the　distribution　law　of　magneto-electric　potential　through　the　thickness　direction　of　the　microbeam　with　various　lay-up　modes　is　discussed.　©　2023　Elsevier　Inc.