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Economic pressures continue to force the petroleum industry to seek less expensive alternatives to conventional gravity based separation. The gas-liquid cylindrical cyclone (GLCC) is a simple, compact, low-cost separator that can provide an economically attractive alternative to conventional separators over a wide range of applications. Although cyclones have long been used for liquid/liquid, solid/liquid, and gas/solid separation, they have experienced only limited use in full range gas/liquid separation applications. The biggest impediment to the wide spread use of GLCCs has been the lack of reliable performance prediction tools in order to know where they can and cannot be successfully applied. This paper presents the status of the development of the GLCC, the state-of-the-art with respect to modeling the GLCC, and discusses current installations and potential applications