The present study was undertaken to evaluate the Effectiveness of structured teaching program regarding knowledge on ethical and legal issues in nursing among staff nurses in selected hospitals at Bangalore. Pre-experimental, one group pre- test, post-test design was used. Convenient sampling method was used to select the samples. Information was collected from 50 staff nurses regarding ethical and legal issues in nursing by using the structured knowledge questionnaire. STP was implemented and post-test was conducted after 7 days to find the effectiveness. Study findings showed that pre-test knowledge scores were found to be 43.05% and after STP the posttest knowledge scores of staff nurses was found to be 77.45% which is enhanced by 34.4%. With the t-test value 25.96* and chi square value 80.18* which is significant at 5% level. Hence the result has proved that STP was effective in improving the knowledge of staff nurses on ethical and legal issues in nursing.