  We provide a L\'evy-It\^o decomposition of sample paths of L\'evy processes
with values in complete locally convex Suslin spaces. This class of state
spaces contains the well investigated examples of separable Banach spaces, as
well as Fr\'echet or distribution spaces among many others. Sufficient
conditions for the existence of a pathwise compensated Poisson integral
handling infinite activity of the L\'evy process are given.
