低电离星系核（LINER，low-ionization nuclear emission-line region）是依据星系核心排放的谱线定义的一种星系。这种类型谱线包括来自低电离或中性原子的发射谱线，像是O、O、N和S。相反的，来自强电离原子的发射线，像是O、Ne和He，是相对的较弱。这种星系核最早是迪莫西·赫克曼在一系列发表于1980年的星系核谱线论文中的第三篇中首度确认的。

A low-ionization nuclear emission-line region (LINER) is a type of galactic nucleus that is defined by its spectral line emission. The spectra typically include line emission from weakly ionized or neutral atoms, such as O, O, N, and S. Conversely, the spectral line emission from strongly ionized atoms, such as O, Ne, and He, is relatively weak. The class of galactic nuclei was first identified by Timothy Heckman in the third of a series of papers on the spectra of galactic nuclei that were published in 1980.