thumb|Military review of service people.
Service class people () were a class of free people in Russia in the 14th to the 17th centuries, obliged to perform military or administrative service on behalf of the state.
Background
There were two main groups of service people:
- hereditary servitors ("servitors by birth"), included boyars, noblemen and "Boyars' children". They served in the "Landed Army", and received land and serfs for their service.
- chosen servitors ("servitors by contract"), included streltsy, Cossacks and clerks. They served in the infantry or administration, and were paid in coin.