Objectives: The current study was undertaken with objectives to assess the effectiveness of protocol on prevention of perineal tear in terms of knowledge and practices of staff nurses.

Method: Quasi Experimental One Group Pre Test Post Test Research Design was used. Total 30 staff nurses were selected from Civil Hospitals of district Ambala and Yamunanagar, Haryana by using Total Enumeration sampling technique. Structured knowledge questionnaire and observation checklist was used to collect data after established validity and reliability.

Findings: SPSS version 20 was used for statistical analysis. In the pretest knowledge mean score was 12.83±3.64 and posttest knowledge mean score was 25.47±1.43. The posttest knowledge mean score is significant higher than the pretest knowledge means score. The calculated‘t’ value (21.77) was significante at 0.05 level. After administration of protocol, practices of staff nurses (t=6.34.) on prevention of perineal tear improved. There was a mild negative correlation (r =.-318) in knowledge and practice of staff nurses on prevention of perineal tear after administration of protocol.

Conclusion: Based on the findings of the study it can be concluded that protocol was significantly effective for enhancing knowledge and improving practices of staff nurses on prevention of perineal tear in selected hospitals of Haryana.