We present the technical details and relevant performance aspects of a dielectric resonator‐based electron paramagnetic resonance probe for stopped‐flow kinetic studies. The major benefits of this system are: (1) It incorporates a small, high sensitivity resonator system that is insensitive to stopped‐flow induced noisy transients. (2) The resonator system is cheap, robust, and easily assembled. (3) It contains a microwave coupling scheme that provides finesse in tuning and freedom from microphonics.