Approximately 140 countries have committed to achieving net zero emissions by the middle of the century under the United Nations Framework Convention on Climate Change. To attain this target, local governments can play a pivotal role in coordinating decarbonisation efforts across multiple sectors, in collaboration with citizens, companies, and other stakeholders. This Discussion Paper aims to highlight key policies and approaches for developing a city's decarbonisation plan, using Da Nang city in Vietnam as an example. To this end, strategies and plans for decarbonising three cities in Yokohama and Kitakyushu City in Japan, and Kuala Lumpur city in ASEAN region are reviewed as good examples. The following actions have been recommended for Da Nang city, based on our investigations, including: (1) increase the ambition of the city’s targets for energy savings to align with the updated national commitments; (2) setting ambitious targets for solar PV would significantly speed up decarbonisation in the city; (3) setting ambitious targets for electric vehicles would help steer the greening of the transport sector; (4) increase and contribute to the country’s carbon sequestration via forest and marine protection; (5) develop the necessary expertise related to GHG inventories, and it is suggested that Da Nang city should consider to establish a ‘local government operations (LGO) for GHG inventory’. Furthermore, Da Nang should also consider to set a target to become a leading city in designing and implementing net zero emission initiatives at the city level, not only in Vietnam but also across the ASEAN region.