Marine tourism is one type of tourism that is developing in Indonesia. This is because Indonesia is an archipelagic country and has enormous coastal and marine resource potential. Kapoposang Island is one of the areas located in Pangkep Regency in Liukang Tupabiring Village with clean water, a wide stretch of white sand and has beautiful coral reefs. The natural beauty of Kapoposang waters is an attraction for tourists, so it is used as one of the marine tourism destinations. This study aims to examine the suitability index of diving and snorkeling marine tourism on Kapoposang Island, Pangkep Regency. The methods used in this study are observation, interview and documentation methods. In the observation of coral cover data collection and lifeform type obtained using the LIT (Line Intercept Transect) method and underwater visual census (UVC) method then by pulling a 50 m roll meter according to the depth and station point that has been determined for diving and snorkeling tourism activities, then interviews were carried out to add supporting data. Based on the results of the study, diving tourism activities have the highest tourism suitability index value found at station 3 of 83.33% and other stations are included in the Quite Suitable category. The results of the analysis showed that from the three research locations, all were categorized as very suitable for diving tourism activities.