The excess molar enthalpies H-m(E) of butylamine + diethyl ether, +dipropyl ether, +bis(1-methylethyl) ether, +dibutyl ether, +1,1-dimethylethyl methyl ether, +1,1-dimethylpropyl methyl ether, +tetrahydrofuran, +tetrahydropyran, and +1,4-dioxane have been measured over the whole composition range at 298.15 K in order to investigate interactions between butylamine and the three classes of ethers, namely straight chain, branched chain, and cyclic. All the mixtures show endothermic behavior. The results reported here are compared to H-m(E) results for related systems involving dibutylamine published recently by our group. The experimental results have been correlated using the NRTL and UNIQUAC equations.