Summary of available data Original or unprocessed data is provided in support of the article “Shape Memory Cellulose-based Photonic Reflectors”. The data is structured into two folders, each correlating to a specific data type presented in the published article. Folder 1: Polarised optical microscopy (POM) The polarised optical microscopy images (.png) used in Figures 1 and in Figure 2 of the Manuscript are provided into their corresponding folders. The scale bar is included in each folder for reference together with an image of the fiber used to collect the spectra. Both folder contain also the reflectivity spectra (.mat) used to plot the graph in Figure 1 and in Figure 2. The films were imaged under with polarizing filters, as described in the Experimental section of the Manuscript. Folder 2: Scanning electron microscopy (SEM) Micrographs cellulose films cross-sections showing the chiral nematic arrangement of cellulose nanocrystals retained after the shape memory polymer infiltration (.tif). The folder ‘Figure 3’ contains high and low magnification images, used for Figure 3 of the Manuscript, the folder ‘Figure S2’ contains the low magnification images, used for Figure S2 of the Supplementary Information. The folder ‘Table 2’ contains the low and high micrographs used to extrapolate the data presented in Table 2 of the Manuscript.