CMS Results on Diffraction

An overview of measurements of diffraction performed with the CMS detector at LHC is presented. The results include observations of diffraction in pp collisions at $\sqrt{s}=$0.9, 2.36 and 7~TeV in minimum bias events, and in events with W and Z bosons at $\sqrt{s}=7$~TeV. The cross-section for diffractive di-jet production is presented as a function of $\tilde{\xi}$, a variable which approximates the fraction of the momentum loss of the proton. For completeness non-diffractive measurements of the energy flow at large rapidities are also shown.