The thermal conductivity of gaseous dimethyl ether (DME) was measured over temperatures range from (263 to 383) K along 13 quasi-isotherms and at pressures up to saturation by the transient two hot-wire method. The standard uncertainty of the thermal conductivity of gaseous dimethyl ether is 1.0%. The gaseous thermal conductivity was correlated as a function of pressure and temperature. The maximum deviation and the absolute mean deviation of measured data from the equations was -0.95% and 0.36%, respectively. The values for the thermal conductivity of the dilute gas and the saturated vapor were obtained by extrapolation.