Solid solutions In2 - xCrxMo3O12 have been prepared via the solid state reaction method. The structural and thermal expansion properties have been characterized using X-ray diffraction. All compounds exhibit monoclinic structure with space group P21/a at room temperature, and transform to orthorhombic structure at higher temperature. Compounds In2 - xCrxMo3O12 (x = 0.7, 1.0 and 1.3) possess strong positive thermal expansion in the monoclinic structure, while their thermal expansion coefficients of orthorhombic structure vary from negative to positive with increasing Cr content. It is worthwhile to note that In1.3Cr0.7Mo3O12 and InCrMo3O12 have near zero thermal expansion properties.