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Abstract Background: A mass casualty incident (MCI) is defined as "an event that overwhelms the local healthcare system, where the number of casualties vastly exceeds the local resources and capabilities in a short period of time." Any MCI can rapidly exhaust available resources for not only the MCI but the normal day-to-day tasks of the hospital. Each hospital should institute a surge plan in preparation for anticipated, progressive, insidious ("notice" events), and sudden-onset ("no-notice" events) disasters occurring within the community. he ability to successfully allocate resources and organize an effective response to an MCI is centered on flexible, integrated communication, and information systems. Objectives : 1) To assess the pre test knowledge level of staff nurses regarding Management of mass casualty incidences. 2) To assess the post test knowledge level of staff nurses regarding Management of mass casualty incidences. 3) To assess the effectiveness of information booklet on knowledge of staff nurses regarding Management of mass casualty incidences. 4) To determine the association between pre test knowledge of staff nurses regarding Management of mass casualty incidences and selected demographic variables Hypothesis: H1- There is a significant difference in the pre test and post test knowledge scores of staff nurses regarding Management of mass casualty incidences. H2- There is a significant association between the pre test knowledge of staff nurses regarding Management of mass casualty incidences and selected demographic variables at the significance level of 0.05. Methodology: The research design consisted of pre experimental research design of one group pretest and post-test design. The population selected for the study was staff nurses of selected hospitals at Bangalore. The study samples were 60 staff nurses and were selected by using purposive sampling technique. The development of the tool involved steps of test construction i.e. preparing the blue print, selection of items, content validation and establishment of reliability. The content validity of the questionnaire was done and modifications were done according to the suggestions given by the experts. Pre testing and reliability of the tools were done. The reliability co efficient of the knowledge questionnaire was found to be 0.893. The tool was found to be reliable. Results: In the Pre test of knowledge regarding Management of mass casualty incidences among Staff nurses that the level of knowledge of Staff nurses before providing information booklet. In that 45(75%) of respondents were have inadequate knowledge, 15(25%) of them have moderate knowledge and no one of respondents have adequate knowledge. Where as posttest 37(61.7%) of staff nurses have adequate knowledge. 23(38.3%) of them have moderate knowledge and 0(0%) of staff nurses were have inadequate knowledge. The means pre-test score was 16.4 and means post test score was 27.2. The difference in knowledge score was 10.8 with percentage gain in knowledge so knowledge was significant after providing information booklet. pre test knowledge regarding management of mass casualty incidences among staff nurses was 16.4 and post test knowledge regarding management of mass casualty incidences among staff nurses was 27.2, which is significant, so there is enough evidence that information booklet is effective in enhancing the knowledge of management of mass casualty incidences among staff nurses. The study was concluded that there was a significant improvement obtained following information booklet on Knowledge regarding management of mass casualty incidences. This study was recommended that there is an immense need for educational programme to improve the knowledge regarding management of mass casualty incidences among staff nurses.