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This study presents the first isolation of Tenacibaculum maritimumfrom farmed Atlantic Salmon Salmo salarin Chile. The isolate, designated T. maritimumCh-2402, was isolated from gills of Atlantic Salmon at a farm located in region X, Los Lagos, Chile, during the harmful algal bloom caused by Pseudochattonellaspp. in February 2016. The algal bloom is reported to have caused 40,000 metric tons of mortality in this salmon farming area. The bacterium T. maritimum, which causes tenacibaculosis, is recognized as an important pathogen of marine fish worldwide. Genetic, phylogenetic, and phenotypic characterizations were used to describe the T. maritimumCh-2402 isolate. The isolate was similar to the type strain of T. maritimumbut was genetically unique. Tenacibaculum dicentrarchiisolates were also recovered during sampling from the same farm. Based on the fact that T. maritimumhas been shown to cause disease in Atlantic Salmon in other regions, the presence of this bacterium poses a potential risk of disease to fish in the Chilean aquaculture industry. Received November 6, 2016; accepted May 29, 2017 Published online July 26, 2017