Basic life support is a specific level of pre-hospital medical care provided by trained responders, including emergency medical technicians, in the absence of advanced medical care. The primary goal of basic life support is to provide oxygen to the heart and brain and to sustain tissue viability until definitive electrical or medical treatment can restore the circulation. This can be done by an individual who has a basic knowledge about basic life support, through which a life can be saved. Hence, the study was undertaken to assess the level of knowledge on basic life support among young adults in a selected college of Thrissur. The objectives of the study were to assess the level of knowledge on basic life support among young adults, and to associate the level of knowledge on basic life support among young adults with their selected demographic variables. The design of the study was descriptive and was conducted among 60 young adults from St. Thomas College, Thrissur. The samples were selected by using purposive sampling technique. Data was collected by using structured knowledge questionnaire regarding basic life support. The result showed that 2(3.33%) samples had poor knowledge, 53(88.33%) had average knowledge and 5(8.33%) had good knowledge. There is significant association between the level of knowledge regarding basic life support among young adults with their selected demographic variables. The study concluded that, majority of the young adults had average knowledge on basic life support.