Microcrystals based on nonlinear organic materials are of great interest for modern photonics, allowing for the formation of miniature optical modules, i.e., resonators, waveguides, connectors, filters, etc., both active and passive.  Such organic semiconductor materials as perylene and its derivatives are currently used in optoelectronics and light-emitting materials industry due to their outstanding properties, for example, high mechanical and thermal stability as well as a high photoluminescence quantum yield. Perylene is a polymorphic crystal with the monoclinic structure that can exist in two phases, alpha or beta, characterized by photoluminescence in yellow or green spectral ranges, respectively. The implementation of resonator structures based on perylene microcrystals for sensorics and microlasers applications seems promising. In this work, resonator properties of perylene microcrystals with the form of  rectangular parallelepipeds (alpha phase) produced by the self-organization technique were studied using nonlinear optical microscopy and spectroscopy methods. It was shown that the two-photon photoexcitation of perylene  microcrystals leads to the appearance of a luminescence spectrum with a mode composition and the localization of the electromagnetic field in certain areas near the crystal faces, which corresponds to the excitation of Fabry – Pérot modes in microstructures.