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We provide a description of the structure of $\aleph_0$-categorical trees andcycle-free partial orders. First the maximal branches of $\aleph_0$-categoricaltree are examined, followed by the configuration of the ramification orders,which are then combined to provided necessary and sufficient conditions for atree to be $\aleph_0$-categorical in terms of these two things. Theclassification of the $\aleph_0$-categorical cycle-free partial orders is foundas a corollary.

The $\aleph_{0}$-categorical Trees and Cycle-free Partial Orders