Microcontact printing biomolecules from elastomeric micropatterned stamps onto surfaces is a versatile method to prepare surfaces for diagnostic applications. We show how to create patterns of proteins having a lengthscale lower than 100 nm using high-resolution microcontact printing. The elastomeric stamps used have meshes composed of 100- and 40-nm-wide lines, arrays of 100 × 400 nm2 features, and arrays of 100-nm-wide posts. The spherical geometry of the posts on the stamps contributes to reduce the printed areas below the effective size of the molded features. Proteins adsorb onto the hydrophobic surface of the stamp during the inking step, and by varying the concentration of the protein solutions, it is possible to adsorb a single or a few protein molecules, such as antibodies (fluorescently labeled) or green fluorescence proteins, on each of the elements forming the high-resolution pattern of the stamp. The transfer of the proteins from the stamp to a hydrophilic glass surface occurs during the prin...