The dataset to accompany the manuscript "Self-Assembly of Quantum-Confined CsPbBr3 Perovskite Nanocrystals into Rhombic, Frame, and Rectangular Superlattices" (DOI: 10.1002/sstr.202500133): -- Absorption and photoluminescence spectra of CsPbBr3 nanocrystal dispersion in toluene (data used in Figure 01a of the Main Text); -- Optical microscopy images of frame-shaped superlattices (partially used in Figure 03); -- Videos S1-S3 illustrating cycles of dissolution-recrystallization of superlattices at the contact line of the drying nanocrystal dispersion; -- Original STEM images of the dissolved nanocrystal superlattices of three different morphologies (habits), rhombic, rectangular, and frames;