哈特里能量记为Eh或者Ha，是原子单位制中的能量单位，以道格拉斯·哈特里（Douglas Hartree）的名字命名。该单位的值定义为2R_∞hc，其中R_∞为里德伯常数,h为普朗克常数，c为光速。

根据科学技术数据委员会（CODATA）2010年的数据，哈特里能量单位的值为E_h = 4.359 744 34(19)×10 J= 27.211 385 05(60) eV。。2006年CODATA数据为E_h = 4.359 743 94 (22)×10 J = 27.211 383 86(68) eV。

The hartree (symbol: Eh or Ha), also known as the Hartree energy, is the atomic unit of energy, named after the British physicist Douglas Hartree. It is defined as 2R_∞hc, where R_∞ is the Rydberg constant, h is the Planck constant and c is the speed of light. The 2010 CODATA recommended value is E_h = 4.359 744 650(54)×10 J = 27.211 386 02(17) eV. The 2006 CODATA recommended value was E_h = 4.359 743 94 (22)×10 J = 27.211 383 86(68) eV.