In order to know the coefficients of thermal expansion in lithium manganese oxide spinels Li[Li x Mn2−x ]O4 with 0 ≤ x ≤ 1/3, X-ray diffraction measurements are performed in the temperature (T) range from 400 to 100 K. The crystal structure for x = 0 changes from the high-T cubic phase ( F d 3 ¯ m ) into the low-T orthorhombic phase (Fddd) below 285 K due to a cooperative the Jahn–Teller transition. Hence, the average coefficients of linear thermal expansion (α L) in x = 0 are very different between the three orthorhombic axes; α L = 1.3(1) × 10−6 K−1 along the a o-axis, α L = 13.1(1) × 10−6 K−1 along the b o-axis, and α L = 5.7(1) × 10−6 K−1 along the c o-axis, where a o, b o, and c o are the lattice parameters of orthorhombic phase. On the other hand, the crystal structure for the samples with x ≥ 0.05 keeps the cubic phase ( F d 3 ¯ m ) down to 100 K. The α L value is almost independent on x at x ≥ 0.05, i.e. α L ∼ 7.0 × 10−6 K−1. This suggests that the bond strength between Mn(Li) and O2− ions does not increase by the partial substitution of Li ions for Mn ions.