卤化物指含有呈负价卤素的化合物，通常为二元化合物。卤离子则指相应-1价的卤素离子。根据具体卤素的不同，卤化物可分为：

拟卤素生成的-1价化合物称为拟卤化物，主要有叠氮化物N₃、氰化物CN、硫氰酸盐SCN和氰酸盐OCN等。

互卤化物则指只由卤素构成的二元化合物，如ICl、ClF₃、IF₅等。

有机化学中，有时也用卤化物来指卤代烃，简写为R-X。根据具体卤素的不同亦可分类为氟代烃、氯代烃、溴代烃和碘代烃。二卤代烷常用于环的构建，参见卡宾。

A halide is a binary compound, of which one part is a halogen atom and the other part is an element or radical that is less electronegative (or more electropositive) than the halogen, to make a fluoride, chloride, bromide, iodide, astatide, or theoretically ununseptide compound. Many salts are halides; the hal- syllable in halide and halite reflects this correlation. All Group 1 metals form halides that are white solids at room temperature.