Nanocellulose and chitosan have recently started to get attention as environmentally friendly piezoelectric materials for sensor and energy harvesting applications. Conversely, current commercially available flexible piezoelectric films made of for example polyvinylidene difluoride (PVDF) are relatively expensive and made from non-renewable materials. We measured the piezoelectric responses (2-8 pC/N) for solvent casted films based on nanocellulose, microcrystalline chitosan and their blends. In addition, the tensile properties of the piezoelectric films were characterized to find out if chitosan could be used to enhance the flexibility of the brittle nanocellulose films. Based on the results, plain chitosan is an interesting piezoelectric material itself. In addition, blending nanocellulose and chitosan could be a potential method for tailoring the properties of solvent casted low cost, green piezoelectric films. media. Depending on the chitin source, the degree of deacetylation should reach approximately 50% before this solubility is achieved. (Rinaudo, 2006) In nature, chitosan is reportedly produced by only some fungi (Grifoll-Romero et al., 2018). Nanocellulose and chitosan have been studied for numerous applications due to their simple water based solution processing, renewable raw material sources, low cost, biocompatibility