Porous glass‐ceramics with a skeleton of the fast‐lithium‐conducting crystal Li1+xTi2−xAlx(PO4)3(wherex= 0.3–0.5) were prepared by crystallization of glasses in the Li2O─CaO─TiO2─Al2O3–P2O5system and subsequent acid leaching of the resulting dense glass‐ceramics composed of the interlocking of Li1+xTi2−xAlx(PO4)3and β‐Ca3(PO4)2phases. The median pore diameter and surface area of the resulting porous Li1+xTi2−xAlx(PO4)3glass‐ceramics were approximately 0.2 μm and 50 m2/g, respectively. The electrical conductivity of the porous glass‐ceramics after heating in LiNO3aqueous solution was 8 × 10−5S/cm