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A helium mini‐cryostat has been developed for the hard X‐ray nanoprobe ID16B of the European Synchrotron to collect X‐ray excited optical luminescence and X‐ray fluorescence at low temperature (<10 K). The mini‐cryostat has been specifically designed to fit within the strong space restrictions and high‐demanding mechanical constraints imposed by the beamline to provide vibration‐free operation and maximal thermal stability. This paper reports the detailed design, architecture and technical requirements of the mini‐cryostat, and presents the first experimental data measured using the cryogenic equipment. The resulting cryo‐system features ultimate thermal stability, fast cool‐down and ultra‐low vibrations. The simultaneous X‐ray fluorescence and X‐ray excited optical luminescence data acquired from bulk GaN and core/shell InGaN/GaN multi‐quantum wells validated the excellent performance of the cryostat with ultimate resolution, stability and sensitivity. [ABSTRACT FROM AUTHOR]