Searches at LHC Beyond the Standard Model

The discovery potentials of ATLAS and CMS experiments for Supersimmetry (SUSY), Extra Dimensions (ED), new Gauge Bosons and R-Hadrons are discussed. Searches at LHC require a detailed understanding of the detector performance, reconstruction algorithms and triggering. Precision measurements of Standard Model (SM) processes are also mandatory to acquire the necessary knowledge of SM background. Both ATLAS and CMS efforts are hence addressed to determine the best calibration candles and to design a realistic plan for the initial period of data taking.