Nanocellulose is a nano-sized material obtained through the mechanical or chemical delamination of wood and plant fibers. It is an emerging type of nature-derived and renewable nanomaterial that shows extraordinary mechanical and lightweight properties. Furthermore, nanocellulose has unique rheological properties, colloid stability, excellent film forming ability with very promising gas barrier properties. Consequently, nanocellulose is becoming one of the most promising sustainable building blocks for future advanced materials.