The need to deposit films of nanomaterials, such as carbon nanotubes (CNTs), graphene, metal nanowires, and metal oxide powders, over large areas for energy and environmental applications has been increasing substantially. Nevertheless, deposition of these nanomaterials at high speed on industrial scales has been a challenge because of issues such as slow deposition rates, poor adhesion, and the need for binders that can adversely affect the functional material performance. The supersonic cold spraying method, in which nanomaterials are accelerated to supersonic speed before impacting a substrate, facilitates deposition of these nanomaterials without any binders, thereby eliminating the need for post-treatment. This is a single-step method capable of yielding uniform coatings over large planar or non-planar substrates with good adhesion on a wide variety of substrate materials. The nanomaterials can be pre-mixed at any required ratio to produce multi-component films. This talk reviews recent developments in the fabrication of functional films by supersonic cold spraying for flexible electronics, lithium ion batteries, supercapacitors, photoelectrochemical devices, surface wettability control, heaters, thermal insulation, pool boiling, and water purification.