Suicides among young people continue to be a serious problem. Suicide is the second leading cause of death for children, adolescents, and young adults. The objectives of the present study were to assess the prevalence and predictors of suicidal ideation among adolescents; associate suicidal ideation among adolescents with selected socio-demographic variables and predictors. Quantitative research approach and descriptive research design was adopted for the study. The study was conducted among 250 adolescents selected through purposive sampling technique from selected Colleges, Thrissur. The tool consisted of a semi structured questionnaire to assess the socio-demographic data, Columbia Suicidal Severity Rating Scale (C-SSRS) screen version to assess the prevalence of suicidal ideation and a structured questionnaire to assess the predictors of suicidal ideation among adolescents. Reliability and validity of the tools were established. Data were collected, tabulated and analyzed using descriptive and inferential statistics. The findings of the study revealed that the prevalence rate of suicidal ideation among adolescents is 28%. The predictors such as lack of teachers support (91.4%), social media abuse (74.3%), loneliness and hopeless (72.9%) are found in most of the adolescents. A statistically significant association was found between education of father (p=0.04) and education of mother (p=0.04) with suicidal ideation among adolescents at p<0.05. The predictors such as family history of suicide (p=0.00), helplessness (p=0.04) and lack of parental support (p=0.01) have a statistically significant association with suicidal ideation among adolescents. The study concluded that the prevalence rate of suicidal ideation among adolescents is significant. The early identification of the predictors can prevent the actual occurrence of suicide among adolescents.