The colouration of textile materials through dyeing requires large amounts of water. This wet dyeing process in the textile industry has contributed to the largest consumption of fresh water in the environment, hence making the industry the second largest global polluter of water. The use of heavy colouring materials such as synthetic dyes and toxic or non-biodegradable dye auxiliaries in the dyeing process poses significant health and safety threats to the ecosystem. Due to the high concentration of heavy metals, hydrocarbons, chlorine, formaldehyde, and other chromium-based chemicals in the dye materials, the wastewater from dyeing, when discharged indiscriminately, affects the quality of the water and the environment. To help reduce the level of pollution from dye wastewater to the environment, significant approaches or technologies have been adopted, most especially waterless dyeing for textile colouration. This technology has several benefits, such as reducing the use of water, hence the non-use of water in the dyeing process, no generation of wastewater, reduced time for dyeing, and less environmental impact. Drawing on these advantages, this chapter discusses key waterless dyeing technologies such as supercritical CO2 dyeing, air dyeing, plasma dyeing, and electrochemical dyeing. Key case studies of real-world applications of these waterless dyeing technologies are also discussed. We further discuss the challenges and regulatory issues concerning the application of waterless dyeing technologies in the textile industry. Lastly, this chapter concludes with insights into potential areas for future studies and advancement in the field of sustainable dyeing practices in the textile industry.