The environmentally friendly synthesis of highly active Fe‐N‐C electrocatalysts for proton‐exchange membrane fuel cells (PEMFCs) is desirable but remains challenging. A simple and scalable method is presented to fabricate FeII‐doped ZIF‐8, which can be further pyrolyzed into Fe‐N‐C with 3 wt % of Fe exclusively in Fe‐N4 active moieties. Significantly, this Fe‐N‐C derived acidic PEMFC exhibits an unprecedented current density of 1.65 A cm−2 at 0.6 V and the highest power density of 1.14 W cm−2 compared with previously reported NPMCs. The excellent PEMFC performance can be attributed to the densely and atomically dispersed Fe‐N4 active moieties on the small and uniform catalyst nanoparticles. An environmentally friendly, facile, low‐cost, and scalable solid‐phase synthesis was developed for a highly active Fe‐N‐C electrocatalyst with iron exclusively in Fe‐N4 moieties. The as‐prepared Fe2‐Z8‐C delivered an unprecedented power density of 1.14 W cm−2 in acidic proton‐exchange membrane fuel cell, which was attributed to the densely and atomically dispersed Fe‐N4 active moieties and the small catalyst nanoparticles.