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A photonic crystal fiber interferometer that operates in reflection mode for humidity detection is presented for the first time which has the advantage that it does not require the use of any hygroscopic material. The fabrication of the sensor head is therefore simple since it only involves cleaving and splicing. The all-silica nature of the device has the potential for many applications. Introduction: The measurement of humidity is required in a range of areas, including meteorological services, the chemical and food processing industry, civil engineering, air-conditioning, horticulture, and electronic processing. By comparison to their conventional electronic counterparts, optical fiber humidity sensors offer specific advantages, such as small size and weight, immunity to electromagnetic interference