During the period of 2012 to 2016, marine casualties or incidents that investigated by NTSC (KNKT) had been increased every year. Investigation of incident has been conducted to determine the cause of occurence event in order to avoid the incident with the same causes in the future. The purpose of this research is to describe marine casualties and incident in 2012 until 2016 based on investigation report of The National Transportation Safety Committee (NTSC). Design of this research is descriptive analytic with method of retrospective case study approach.Population and sample of this research are all completed final report of investigation and has been published by KNKT during the period of 2012 to 2016, which is 18 final report of investigation. The results of 18 incidents, that involving 25 vessels, and the contributing factors that casues incident are 45% from liveware, 22% from software, 17% from hardware and 16% from environment. Marine casualties and incident given an effect losses in human, property and environmental. Keyword: Marine casualties, incident, investigation