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The performance of a centrifugal compressor with a range of low solidity diffuser vanes is discussed. The effect of vane leading and trailing edge angle was investigated while maintaining a basic design with 10 vanes and a solidity of 0.69. The diffuser vanes were designed with a circular arc camberline and a specified leading edge angle. The trailing edge angle was varied by specifying a range of angles through which the vanes turned. Vanes with leading edge angles of 65°, 70°, 75°, and 80° were considered together with vane turning angles of 10°, 15° and 20°. All results are compared with those obtained with the standard vaneless diffuser configuration. Despite the low solidity configuration none of the vane designs provided a broad operating range and it would be necessary to deploy a variable geometry arrangement.