Kiunganishi cha chini ni aina ya viunganishi vinavyotumika kuunganisha kishazi tegemezi au tegemezi kwa kishazi huru au kikuu katika sentensi. Ni neno linaloonyesha uhusiano kati ya vishazi, kuonyesha kwamba kishazi inachotanguliza kina umuhimu mdogo au ni chini ya kifungu kikuu. Mifano ya viunganishi vya chini ni pamoja na maneno kama vile "kwa sababu," "ingawa," "ikiwa," "wakati," "tangu," "isipokuwa," "wakati," "ilhali," na "iwe."