demophobia
A phobia, or fear, of crowds, masses, or people.
rare, uncountable
Those who suffer enochlophobia, demophobia or ochlophobia–the fear of crowds–are not being entirely irrational.
Where it comes from
From Ancient Greek δῆμος (dêmos, “common people”) + -phobia, equivalent to demo- + -phobia.
Adapted from the Wiktionary entry demophobia (CC BY-SA 4.0).