Top physics is a pillar of the physics programme at the LHC.
It involves precision measurements, leading to constraints on standard model parameters, as well as many measurements of observables sensitive to new physics.
In this seminar, an overview of measurements performed by the CMS experiment in the domain of top physics will be presented, based on pp data collected in 2011 at a center-of-mass energy of 7 TeV.
The results will be compared to expectations from theory. Emphasis in will be given to more recent results and to the treatment of systematic uncertainties.