Russell, Tanya L. and Burkot, Thomas R. 2023. A guide to mosquitoes in the Pacific. Pacific Community, Noumea. The Pacific is home to 11.4 million people residing in 22 countries and territories across the region. Recently, the Pacific has been experiencing unprecedented outbreaks of dengue, chikungunya and Zika virus alongside ongoing malaria and lymphatic filariasis transmission with direct effects on morbidity and mortality. The ongoing transmission of mosquito-borne diseases places a heavy toll on already fragile health systems with local economic and social repercussions. This handbook provides practical and basic biological information on the behaviours and distribution of the mosquitoes of the Pacific region as they are presently known. This handbook is a foundational reference for all those working towards reducing the transmission of mosquito-borne diseases in the region. An overview of the diversity and distribution of mosquitoes throughout the Pacific, including checklists for the species present in each of the 22 Pacific Island countries and territories, is provided. For the mosquitoes that are common and/or of medical importance, one-page profiles are provided that include information about their key behaviours.