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Despite the remarkable advances made in the development of 2D perovskites suitable for various high-performance devices, the development of sub-30 nm nanopatterns of 2D perovskites with anisotropic photoelectronic properties remains challenging. Herein, a simple but robust route for fabricating sub-30 nm 1D nanopatterns of 2D perovskites over a large area is presented. This method is based on nanoimprinting a thin precursor film of a 2D perovskite with a topographically pre-patterned hard poly(dimethylsiloxane) mold replicated from a block copolymer nanopattern consisting of guided self-assembled monolayered in-plane cylinders. 1D nanopatterns of various 2D perovskites (A & PRIME;(2)MA(n)(-1)Pb(n)X(3)(n)(+1),A & PRIME; = BA, PEA, X = Br, I) are developed; their enhanced photoluminescence (PL) quantum yields are approximately four times greater than those of the corresponding control flat films. Anisotropic photocurrent is observed because 2D perovskite nanocrystals are embedded in a topological 1D nanopattern. Furthermore, this 1D metal-coated nanopattern of a 2D perovskite is employed as a color conversion optical polarizer, in which polarized PL is developed. This is due to its capability of polarization of an incident light arising from the sub-30 nm line pattern, as well as the PL of the confined 2D perovskite nanocrystals in the pattern., Funding Agencies|National Research Foundation (NRF) - Ministry of Science and ICT [2022R1F1A1076251]; National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2018M3D1A1058536]; National Research Foundation of Korea (NRF) - Korean government (MEST) [2020R1A2B5B03002697]; National Research Foundation of Korea - Ministry of Science, ICT and Future Planning [2022M3C1A3081211]; Open Resource Research Program of the Korea Institute of Science and Technology [2E31551]; National Research Foundation of Korea [2022R1F1A1076251, 2022M3C1A3081211] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)