These Proceedings represent the metallurgical engineering and materials science research presented at the 62nd Annual Conference of Metallurgists (COM 2023), held in Toronto, Canada, from 21 to 24 August 2023. The Annual Conference of Metallurgists is organized by the Metallurgy & Materials Society of the Canadian Institute of Mining, Metallurgy and Petroleum (MetSoc of CIM). The collection themed ‘Climate Change and Sustainability’ presents findings on a wide range of topics, including:Advanced Manufacturing and MaterialsSustainability: Integration for Better OutcomesLight Metals for Transportation and Next Generation VehiclesDerek Kerfoot Memorial Pressure Hydrometallurgy SymposiumLaplante-Laskowski Symposium on Mineral Processing FundamentalsWasmund Memorial Symposium of Sustainability in Pyrometallurgy