Hybrid　halide　perovskites　emerging　as　a　highly　promising　class　of　functional　materials　for　semiconductor　optoelectronic　applications　have　drawn　great　attention　from　worldwide　researchers.　In　the　past　few　years,　prominent　nonlinear　optical　properties　have　been　demonstrated　in　perovskite　bulk　structures　indicating　their　bright　prospect　in　the　field　of　nonlinear　optics　(NLO).　Following　the　surge　of　3D　perovskites,　more　recently,　the　low-dimensional　perovskites　(LDPs)　materials　ranging　from　two-,　one-,　to　zero-dimension　such　as　quantum-wells　or　colloidal　nanostructures　have　displayed　unexpectedly　attractive　NLO　response　due　to　the　strong　quantum　confinement,　remarkable　exciton　effect,　and　structural　diversity.　In　this　perspective,　the　current　state　of　the　art　is　reviewed　in　the　field　of　NLO　for　LDP　materials.　The　relationship　between　confinement　effect　and　NLO　is　analyzed　systematically　to　give　a　comprehensive　understanding　of　the　function　of　dimension　reduction.　Furthermore,　future　directions　and　challenges　toward　the　improvement　of　the　NLO　in　LDP　materials　are　discussed　to　provide　an　outlook　in　this　rapidly　developing　field.　©　2021　Wiley-VCH　GmbH.