A new photo-processable hybrid copolymer based on gelatin-poly(trimethylene carbonate) (Gel-g-PTMCn) was elaborated and showed a promising potential as resin for stereolithography towards the fabrication of scaffold for tissue engineering. Various lengths of PTMC were grafted from gelatin using hydroxy and amino side groups of the constitutive amino acids. The characterization of resulting hybrid copolymers was fully investigated by quantitative NMR spectroscopy before rendering them photosensitive by methacrylation of the PTMC terminal groups (Gel-g-PTMCn-MA). Homogeneous composition of the photo-crosslinked hybrid polymers was demonstrated by EDX spectroscopy and electronic microscopy. By performing subsequently water absorption,contact angle measurements, and degradation study we also showed the contribution of PTMC amount on the hybrid polymer behavior. The photo-crosslinked materials immersed in water were examined by using tensile experiments and displayed a large panel of materials from hydrogel to elastomer-like. Moreover, the absence of cytotoxicity conducted following the ISO10993 assay, validated the potential of such hybrid polymers in tissue engineering. As proof-of-concept 3D porous objects were successfully fabricated using stereolithography showing the great potential of those hybrid copolymers to be used as scaffolds for tissue engineering and regenerative medicine.