A flow-mixing calorimeter has been used to measure the excess molar enthalpy H-m(E) (p degrees) of (nitrogen + dichloromethane)(g) at standard atmospheric pressure (p degrees) over the temperature range (323.2 to 423.2) K. The measurements were analysed using pair potential parameters for nitrogen, assuming suitable combining rules for the calculation of cross-terms, and finding parameters of the Stockmayer potential for dichloromethane which Fitted the excess enthalpy measurements. These parameters are epsilon/k = 722 K, sigma = 0.318 nm, and t* = 0.289. Second virial coefficients calculated from these parameters are in accord with those from (p, V, T) experiments.