Searches for leptoquarks, Extra Dimensions, and Dark Matter

We present results from several searches for various exotic physics phenomena like large extradimensions, leptoquarks, and dark matter, in proton-proton collisions at$\sqrt{s} = 7$ and $8~TeV$ delivered by the LHC and collected with the CMS detector. Many differentfinal states are analyzed using the data collected in 2011 and 2012 corresponding to an integratedluminosity up to $5.0fb^{-1}$ and $19.7fb^{-1}$. No sign of new physics beyond the standard model has been observed so far and the results are used to set new limits on the various model parameters.