Waterborne polyurethane dispersion (PUD) technology has been increasingly becoming significant in the market of environmentally friendly materials for advanced coating and adhesive applications due to their high performance with zero or near zero volatile organic content (VOC) in recent decades.Although the versatile chemistry of polyurethanes enables one to design high performance coating, adhesive or elastomeric materials for a wide range of applications, current synthetic routes for linear polyurethanes have limitations in the introduction of chemical functional groups on the polymer backbone. In waterborne coating and adhesive applications, self-crosslinking polymers offer unique advantages of both one-component and two-component systems such as the ease of use and enhanced mechanical properties, respectively. Due to self-curable behavior of silane groups when exposed to moisture and heat, they have become the most popular material in adhesive and sealants industry. The present study focuses on the synthesis and characterization of silane functional, waterborne, highly branched polyurethanes via the oligomeric A2 + B3 methodology, in which amino-functional, anionic and branched polyurethanes were synthesized, followed by functionalization with 3-isocyanatopropyltriethoxysilane (IPTES) prior to the dispersion step. The stability of final dispersions was confirmed by dynamic light scattering (DLS), solution viscometry and pH measurements. It is important to note that while the intermediate amino-functional polyurethane films alone had poor mechanical and chemical properties, coatings obtained from silane functional waterborne polyurethanes were self-crosslinked by hydrolysis and condensation of ethoxysilane end-groups during the film formation and drying processes, resulting in enhanced mechanical properties and chemical resistance. A detailed investigation of the effect of A2:B3 ratio during the polymerization and characterization of final corresponding films by