Inkjet printing technology encompasses the generation, control and deposition of 10-100 um liquid drops. Besides graphic printing applications, new opportunities for inkjet printing are starting to be exploited commercially in the manufacture of high value, high precision products. The applications include flexible electronics such as sensors and logic circuits as well as 3D biological tissues and organs for regenerative medicine. This talk covers from the fundamentals of inkjet printing to the wide range of electronical and biological applications. I will begin with the introduction of inkjet printing process from ink rheology to jet formation, drop impact and drying. Next how the inkjet printing can be used to fabricate thin-film transistors with a focus on 3D-stacked transistors and circuits as an innovative route for scaling in printed electronics, followed by flexible and wearable sensor arrays. Finally, another new application of inkjet – 3D printing of living cells and biomaterials for tissue engineering and regenerative medicine will be discussed. This part of the talk will show how living cells can be ejected from micron-sized nozzle and how multiple types of cells can be patterned into liquid-filled plate with high-resolution and high-precision. The fabrication processes and applications of inkjet-printed artificial skin and lung models will be introduced.