Three-dimensional (3D) mesoporous tungsten oxide single crystals has been prepared by using aminosilylized 3D mesoporous SBA-15 as the template and characterized by X-ray diffraction, transmission electron microscopy, and selected area electron diffraction. The product is an array of hexagonally ordered nanorods linked by nanosized bridges to form a 3D open framework as an inverse replica of SBA-15. © 2005 Elsevier B.V. All rights reserved.