Abstract: This study investigates the use of deep eutectic solvents (DES) in direct laser metallization (DLM) for the deposition of cobalt patterns on glass substrates. In order to extend the DLM technique to cobalt, a systematic study was conducted to synthesize a DES containing cobalt salts, specifically cobalt acetate and cobalt chloride, in different molar ratios. By optimizing the scanning speed and laser power, metallic structures with electrical conductivity were fabricated. Characterization techniques, including X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX), confirmed the successful formation of cobalt patterns, while morphological studies revealed a well-developed structure without cracks or discontinuities. The results underscore the potential of DES in laser fabrication and demonstrate its versatility in facilitating the deposition of metal patterns. © 2025 Elsevier B.V., All rights reserved.