SEMC may refer to:
ICAO airport code for Macas Airport in Macas, Ecuador Sawnee EMC, electrical cooperative in Cumming, Georgia, United States Snow Entomological Museum Collection at the University of Kansas Natural History Museum Acronym for "Social, Ethical, Moral and Cultural" factors in research and education Sony Ericsson Mobile Communications AB, now called Sony Mobile Super Evil Megacorp, makers of the video game Vainglory