Suicide is an act of taking one's own life voluntarily. The caregivers often come in contact with patients to find the early warning signs and preventive measures for suicide among mentally ill patients. The objective of the study were1) To assess the knowledge regarding early warning signs of suicide among caregivers of mentally ill patients. 2) To assess the knowledge regarding preventive measures of suicide among caregivers of mentally ill patients. 3) To find out the association between the knowledge of early warning signs of suicide among the caregivers of mentally ill patients with selected sociodemographic variables. 4) To find out the association between the knowledge of preventive measures of suicide among the caregivers of mentally ill patients with selected sociodemographic variables. Material and methods of study were tools developed in the form of three sections demographic variables, general knowledge and early warning signs of suicide, and preventive measures of suicide. The non-probability purposive sampling technique was used for selecting 150 caregivers from psychiatric hospitals. Results of the study indicated that findings of demographic variables reveal that, there was a significant relationship found between knowledge of early warning signs of suicide with religion, residence, duration of care given by caregiver and there was a significant relationship found between knowledge of preventive measures of suicide with a diagnosis of the patient, religion, duration of care given by caregiver, History of suicide attempts inpatient. The finding of the study reveals that a maximum number of samples (62.7%) had average knowledge of early warning signs, (20%) had Good knowledge, and (17.3%) had poor knowledge of early warning signs of suicide. And a maximum number of samples (56%) had average knowledge of preventive measures, (21.33%) had good knowledge, and (22.67%) had poor knowledge of preventive measures for suicide. The study concluded that caregivers have significant knowledge about the early warning signs and preventive measures of suicide among caregivers of mentally ill patients.